The Most Common Source of Axle Noise on Ford Trucks

In this video we show you what a failed differential bearing sounds like and looks like.
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The information, demonstration and any content contained in this video is for informational purposes only. The user and BSG Automotive (hereinafter “FordTechMakuloco”) makes no warranty, express or implied, regarding the effectiveness or safety of the contents of this video. In no way should the contents of the video, including the tools used, be repeated or tried by anyone. Viewers should only seek the help of a trained professional located at a licensed auto repair shop for any fix, modification, alteration, or any change to their vehicle. FordTechMakuloco shall not be liable for any injury, damage, or loss to any person or property that may result from use of the tools, equipment, or any content contained in this video. In addition, there is no way to guarantee that the video is not altered or modified or is not in the final form submitted by FordTechMakuloco and therefore, FordTechMakuloco does not warrant that the video is unaltered or not modified. The links on this video to products are for informational purposes only and in no way are an endorsement of the safety or effectiveness of the particular product. Viewers understand that anything contained in this video or linked to or from this video is the sole responsibility of the viewer and in no way provides an express or implied warranty as to the safety or effectiveness of any linked tool, product, or video. Therefore, viewer agrees to release, waive, and discharge FordTechMakuloco or anyone affiliated with FordTechMakuloco, from any and all liability, claims, demands, actions, and causes of action whatsoever arising out of or related to any loss, damage, or injury, including death, that may be sustained by the viewer, or to any property belonging to viewer, regardless of whether the loss is linked to the use of the contents of this video, or otherwise and regardless of whether such liability arises in tort, contract, strict liability, or otherwise, to the fullest extent allowed by law.

[@Truth-and-the-life]

You are an honest mechanic, 3 shops told me I need a rebuild $2500 to $3500. Afywr watching several.of these vids, my guess is 5 hrs to R and R the pinion? Even ar 7 hours, at 185$ an hr...anyhow, we need more honest guys like you!

[@kwukpi989]

I began hearing this on my 05 F-150 a couple months ago. Brought it to my local shop and they said they couldn't hear it but I know my truck and the noises it makes. I gotta bring it back and send them a link to this video. Thanks for this mista

[@josephcirelli9642]

I am with the other people’s posts, you are one of the most knowledgeable mechanics out there! I always enjoy your videos! I have a ‘05 F350 SRW 6.0L but trucks are trucks and somethings are the same. Thanks for all you do making your videos and look forward to seeing your next video!

[@calholli]

I've heard a lot of bad stories about the 6.0L -- make sure you are learning about that engine and what it takes to make it bullet proof.

[@thesouparmy15]

@@calholli its because people dont maintain them. and they throw a punch of power on it and skip out on the basics.

[@bradkennedy4250]

Would love to see the reassembly of this.

[@squangan]

I had Ford replace both my diff fluids (and every other fluid) at 30,000 miles to give it a flush after a good break in period. Then I replaced the fluids with Amsoil another 30,000 miles after that. 13 years of pulling a trailer later my diffs are still as quiet as the day they were new. I don’t know if that’s due to the maintenance but it certainly didn’t hurt it any, I’m happy spending a few bucks keeping fluids changed rather than paying for untimely repairs later.

[@romainberger]

Unfortunately it isn't a maintenance issue, most technicians are undertrained in differential/pinion preload. It's really a big deal! You can find some very interesting stories about brand new vehicles (out of the factories) with mysterious unsolvable noise from the rear axle... The rotational torque of that pinion gear has to be around 20in/lbs for a brand new arrangement, less than that it's noisy or could be misaligned under load resulting what we see on the video, more than that you significantly reduce the bearing lifespan. Look that up it's good stuff if you're interested.

[@lashlarue7924]

He mentioned it in the vidjya. It's not the fluids; it's how they set it up at the factory. (But please keep changing your fluids, which you are doing a good job on. 👍)

[@mrvv8337]

@@romainberger This was totally a maintenance issue. The pinion bearing was pitted from rust. The bearing was not fatiguing from too much pressure and flaking off. The fluid had moisture and/or the truck (still has a new smell) sits and had condensate that pitted out the bearing. Fluid changes at 10, 30, and 60k would have prevented this repair.

[@DayBowBow]

People always making excuses for ford's incompetence.

[@bobfognozzle]

Why doesn’t Toyota have the same problem…they are mass produced….WTFO.

[@WhateversClever777]

Man I’d be lost without you. For the longest time I was convinced the noise was my front wheel bearing but it passed every test and I was ready to pull my hair out trying to figure this out.

[@tkrdg7885]

I replaced TWO NEW wheel hub assembly ( bearing) , noise still there 😂😢🎉❤😅😊

[@WhateversClever777]

@@tkrdg7885 I ended up just replacing the IWE since it was a cheaper part and it fixed it. It hasn’t made a noise in 6 months.

[@Tonybfishin]

@@WhateversClever777IWE?

[@thomasbabcock5174]

Best mechanic on KZbin hands down. 😎

[@nysios5159]

I can't tell you how badly I wished I lived closer to you! Thank you for all the videos, you have saved me countless hours and $$ maintaining my 2010 F150!

[@GKnee72]

I really appreciate when you have the opportunity to let us hear things that are bad, you let us hear it too! When my transfer case was going I would hear humming when I gave it gas and it would stop when I let off the gas!

[@JoshDemit]

How much to replace that?

[@okdon405]

I have a 2011 F150 with 57K miles that is making that terrible noise. I'm confident that you just showed me my problem with my truck. Thank you!

[@lashlarue7924]

You are one of my favorite YT content creators. Every video is absolutely professional to a 'T'. I wish you were my mechanic. Please keep up the phenomenal work you do! 🤩👍

[@MrHossola]

Yup bearings worn out, I always try and stuff 3 full qts in a 9.75 and never had one fail yet. As usual, nice job Brian!!

[@LPerez]

Literally just got mine fixed after hearing it for almost a year and wheeling hard. Kept looking through your channel for some more diagnostic clips but knew it was more than likely the rear end. Shop said mine were bad (metal on metal inner and outer bearings), just glad I left it to the pros. All seals and bearing replaced. She's quiet now and feels like less resistance when coasting or driving.

[@treyhoagland8830]

how much did it run you?

[@LPerez]

@@treyhoagland8830 funny how it’s not a known repair cost… I spoke to two different shops, one went MIA but said btwn $1100-$1700. I went with another shop whose quote was less and were responsive (mainly work on race cars). All seals and bearings for a 9.75 rear end on my Raptor was $800, glad those other clowns stopped responding. She’s quiet and all I hear is the engine and probably a manifold leak now.

[@treyhoagland8830]

@@LPerez gotcha, thanks

[@chrisstromberg6527]

Wow, $800 seems really cheap, the parts alone were like $500 for me. Plus it’s a lot of labor to take everything apart and put it back together.

[@georgelewis9729]

Awesome content Brian as usual. I’m with everyone else I wish I lived closer so I’d know I was dealing with the most honest Tech on the planet!!

[@Canbechangedtwiceeveryfourteen]

I appreciate how you take us along for the diagnostic test drive

[@michaelandrews1740]

Would love to see a rear differential rebuild. Watched one from robinsonauto that was pretty good but I never feel 100% without a FT video

[@Jason-ju7df]

Yeah, on a Dana 60HD

[@Khlandestine]

@@Jason-ju7df so I could swap one of those onto an old econoline e350 if I ever wanted to or nah?

[@Khlandestine]

@@Jason-ju7df I have the big heavy duty axels that stick out with their own cover exposed

[@xTRExDADDYx]

You sir are a godsend! Been racking my brain on this for a few months. I was thinking I was having some kinda bearing noise. But it' not persistent with the rolling of the truck. Its exactly as you describe it from 1:33 to 1:50. Same truck. 06 FX4 102k miles. Now I know what I'm opening up in the morning.

[@eddieweigel9490]

Your an honest good old fashioned mechanic not to many of you guys left you actually remind me of my Uncle Rudy he was a diesel mechanic for many years in Arizona on what they call a Truck farm there

[@johnmclaren7059]

Awesome content Brian! Not only are you a crack shot technician, but your camera & sound ability is just as good!👍 thank you for all your videos , keep them coming sir!

[@antoniomadrid5233]

Dude you’re a Gem! Now i know the problem to my ford after so many videos. More people like you is what we need

[@chrisstromberg6527]

Geez, talk about a perfectly timed video. I have been trying to figure out for the last month here, if I have a bad wheel hub, bad tires, or this! I'm pretty certain my my rear differential bearing is failing. You are an incredible resource for us F150 owners Brian, thank you again!

[@chrisstromberg6527]

Finally got around to working on my differential. The right side carrier bearing race had a small amount of pitting. I replaced all of the bearings including the outer axle bearings, what a PITA! No more rear differential noises! There were a lot of gotchas along the way performing this job, but so far so good!

[@josephmorrone2660]

Another satisfied customer ………. For life ! Well Done !

[@lvlndco]

For years I took my 06 F150 to multiple Ford dealer shops telling them the rear end had problems and was getting loud. Even when it started howling they'd say there was no problem. Eventually I ended up in Junction City, KS for a few weeks and took it to the Ford dealer there. They immediately called me about the horrific prehistoric monster noise it was making...I explained that yes, that is what I was needing addressed. They were amazed that anyone would say there was no problem...there was extreme damage to the gears, races and bearings...it was a $3,000 repair. Now this summer the noise is starting again.

[@johnoverly3407]

I just received an email from Ford Authority that featured this video in it. Brian rocks!

[@FordTechMakuloco]

Nice!

[@patrickursomanno8861]

Wish I lived by your, amazing how knowledgeable you are. 👍

[@amazin1827]

I have also found CASTING SAND inside the hub between the bearings that gets ground up in the grease.

[@arathegreat818]

Normally I look up videos when I have a problem. But you sir. I watch for fun.

[@okhotrodder]

My brother lives on the east coast. He took his truck('17 F150 w/80k miles) to several dealers and they all told him his trans was going out. All with hefty fix cost. It had the so-called dreaded trans hone. He had to come to okla to get his trailer/car. He said he thought he was going to break down before he got here. I took a ride and within 1/2 mile I told him it wasn't his trans. It was his axle. He looked at me dumbfounded. He borrowed a vehicle and left his here for me to fix. I pulled it apart. All carrier and pinion bearings were ate up. A lot worse than the one in your video. The hard part was finding a bearing kit for the super 8.8. Oreillys, advance, autozone didn't have anything to fit it. I literally ordered every kit listed for several years, axle sizes, engine sizes, etc and no luck. The pdc told me the bearings were back ordered. I ended up buying a set from national drivetrain out of all places on ebay, (83-1047-1) which ended up being a Richmond set for $219.52. I just wonder why no one could look up the part number. Even summit & jegs(at the time) didn't show the number on the box. I finally got the bearings all installed. The Richmond set had the original koyo bearings in it, so every spacer was right on. The crush sleeve was the headache. It didn't matter what I did, it wouldn't crush. 3/4" 4ft bar with yoke lock wouldn't crush it down. 1200 lbft impact no luck. Nothing I tried worked. I took it apart a couple times to make sure everything was in correctly. I know it's not right, but I had to disassemble and install the original crush sleeve. It went right in and I tightened it up till it had the correct drag. No slack and seemed to work fine. Got it back together and works like a charm. I've been driving it for a few weeks now and the only thing I notice is the gears are whining a little right between drive and coast. So little I'm the only one that hears it. I'm assuming since he drove it so long, many thousands of miles with the bearings tore up that it wore the gears and the only way to fix it is replace them. I'm not an axle expert but I've prob did a couple dozen in my time. He's def glad it was under $300 to do the bearings with oil and not the over $4k the dealer was quoting for a trans. I wanted to mention also that he hauls a ton of weight. He maxes out the rated capacity with his huge rv. He has airbags that get 85psi to support the rear and weight distributing equipment. He should've got a gooseneck and not a bumper pull. But he carries his dirt bikes in the bed. And if he didn't have a lead foot, it would prob help.

[@tedthornton7791]

Again Good info Brian. Took my 06 F150 Lariat 5.4 2 WD to a independent shop for whining/roaring you so accurately described. I'm anticipating the bearings you described to need replacing. Ford dealers estimate was $3850 which includes ring gear I think. Wish I could figure a way to send you a copy of the estimate. I spoke to you few days ago about another issue. The 45 mph low rpm up hill climb producing misfiring under load. The independent shop going to replace all 8 plugs with Motorcraft plugs and test coil resistance. Intake cleaner run thru and drive hot 1400 to 1600 for differential rebuild provided gears are ok 500 to 600 for R/R 8 MOTORCRAFT PLUGS , test coils and intake cleaner. Provided nothing crazy occurs. He said he has good luck with the intake cleaner and driving hot before plug replacement reducing chances of plugs breaking. So 1600 + 600= $2200 provided gears ok Praying for good success by next week. Lol

[@chrisstromberg6527]

Thanks!

[@mikechiodetti4482]

Good work Brian. It's quiet and rolling easy.

[@flowerchild777]

That was your truck?

[@radman999]

This channel is the best advertisement for Toyota

[@PNW_Car_Mods]

Those things have been beat with the UGLY stick. and no more V8? eff them.

[@craigbutler623]

Yeah, would be so nice to have to replace engines and not be able to trade my truck in, eff Toyota.

[@tombarnes1871]

Recently I replaced the transaxle fluid in my 2018 Explorer 27,000 miles. It doesn’t call for a fluid change until 60,000 miles but I wasn’t happy with the way it was shifting up/down. I was surprised how dark the fluid was, though it was not burnt, it felt thick and didn’t have a good smell to it. Used a good quality trans fluid and nothing else. Car shifts smoothly now up and down. I’ll probably do this every 25,000 miles from now on. In contrast, the engine oil was very clean, had good body and smell.

[@jsvaldez88]

I’ve got an 06 Ford F-150 Lariat at 215k and I’m having rear pinion bearing and seals replaced as we speak. Funny thing is, I started your video here and my mechanic called and confirmed it lol.. love all your work brother 🤙🏽 definitely learned a lot from all you share 💯👌🏽

[@quintaofensiva1432]

Great video as always, but I would like to have seen you show exactly how your tore down, replaced/rebuilt, then put back together the rear differential. Especially pointing out areas were you could make a mistake.

[@FordTechMakuloco]

I have a video about that too. I just need to edit it.

[@jeffreykipp6839]

@@FordTechMakuloco Did you go ahead and replace all of the bearings and races since you had the differential apart?

[@FordTechMakuloco]

yes

[@Nerffy]

@@FordTechMakuloco can't wait to see that video along with where to get parts.

[@NJ-dd3bk]

@@FordTechMakuloco can't wait! My 07 has this same noise and I've been trying to diagnose it for months now with no success.

[@markmathews547]

Good instructional video on what constitutes and differentiates bearing noise from gear noise.

[@williamchristenbury1774]

That really looks like it was a bad bearing from the bearing factory...or the diff got moisture in the case and wasn't driven for a while. Either way, great video...as always.

[@fredsalter1915]

Dang! Getting a "Children of the Corn" vibe! Great video, as always!

[@originalstormtrooper2242]

Damn I wish I could get my 2000 f150 to u brother!! Bc not many trustworthy mechanics left in this world! But you seem to be the best I seen so far and you're 750 miles away from me ! And I want to bring my truck to u so bad that it's not even funny !! My hat is off to u my friend!!

[@joet3720]

I love it when I can actually see the wear on the bearing, if you can't see it you might be able to feel it rolling it with your fingers and feel the grit.

[@George-Edwards]

You are amazing Brian. I had a 78 Mustang Cobra (cough Pinto) years ago that developed a brg noise. After a week or so of using all the clues I could get I thought it has to be the rear output brg in the trans so I went and bought a new one before I even pulled the trans. Sure enough there were visible rough spots in the outer race. Changed it put it all back together and all was good. My next door neighbor at the time was a metallurgist at Chrysler's headquarters and ask me to give him the brg to analyze. A few days later he brought me a piece of the brg embedded in sort of plastic where they had highly polished a cross sectional cut of it. He said they had looked at it under high magnification (maybe electron microscope) and decided that there had been contaminates in the steel when the brg was made. I wonder why they don't put a magnet in differentials like they do in transmissions and other things. Oh how I wish I was young again. George

[@ericslagle6481]

Great content! I’ve learned so much from your channel. I’m getting a bearing noise from the rear diff on my 14 expedition. Based on your logic I’m almost certain it’s the bearings because the sound is constant whether your on the gas or cruising. My question is, on the expeditions differential access is dicey due to the cover being butt up against the frame. To replace the bearings, do you have to drop the whole differential to do this job?(pinion and/or carrier bearings). Thanks again for the invaluable videos!

[@Schneids15]

Thanks again. Always appreciate your videos. Have a F150 With 240K Miles still going strong and driving smooth. Running into the odd issue as every vehicle but this thing keeps going. Thankfully have the 6.2L

[@marksearcy9708]

Another great video. I have built the old 8" and 9" but not anything newer. Great work

[@MTLeopold]

Thanks for taking the time to post the video. Great visual, I really couldn't hear the noise on the before shot but having the visual was great.

[@FordTechMakuloco]

Oh it was very clear.

[@MTLeopold]

@@FordTechMakuloco My ears are getting bad these days. Worked next to conveyors all day for years and years. Like the old timers I knew when I was a kid, listening can be a great tool.

[@jamesplotkin4674]

Another great video, Brian. Thanks for it. I had an 03 Town Car with a rumbling noise and I thought it was badly worn tires. Well, after installing a new set of tires, the sound didn't change at all! Took out the axles, as there was an issue with improper hardening of the axle surfaces and sure enough, the surface looked like this one. All flaking off. New axles and bearings later and the noise went away completely. Apparently, the hardening process was done incorrectly, or the metal itself was bad. Funny thing, the bearings looked fine, just the axles were flaking.

[@mikehenry4743]

There was actually a recall for that issue.

[@Khlandestine]

Wow

[@MrWontstopthefunk]

What did your noise sound like? I’m considering buying a car that might have this issue but I’m scared the whole rear is bad as opposed to just an axle bearing (seems too easy 😅)

[@clutch5sp989]

I bought a very-very used 2001 F150 265k because I knew Brian would have a repair/advise for every prob these trucks have. So far, things are getting repaired before anything goes boom. Right now I'm trying to find the source of a whine noise HW driving also a grumble grumble when turning from a stop.

[@threedog22]

I have a 2014 5.0 with 60k miles and had differential work around 45k miles in 2019, and now the noise is back. Good times!

[@chriscadman5715]

Excellent expose. Great videography and narration. Always a please to watch!

[@Khlandestine]

Like obviously I have to watch specialized videos recorded on a flip phone for certain odd repairs that are super specific but in general as a ford owner this looks like my new fav channel for a non autistic mechanic breakdown of these issues and parts etc

[@rickszabo4312]

Can't believe a service tech would miss out on a gravy job like a rebearing. Things that are a must when you rebearing a diff. Clean, Clean and reclean the tubes and the center . Preload on pinion and carrier bearings then backlash , from my experiance with using the old gear set I don't get to excited about gear pattern , will do pattern checks on new gears and ones where the bearings are found to be in good condition but diff was noisy. Hey Mr. Makuloco do you have any tips on how to remove the rear hubs on a newer f-250 ,350 full floater , without wrecking the backing plate then when you pop the hub seal out you don't destroy the ABS tone wheel and the thin inner bearing spacer. I start with a harmonic balance puller on the hub after I get the outer bearing out of the way. Thanks you have saved my Canadian bacon on a lot of jobs.

[@tt6518]

Hello, Have a question for you, what do you use to clean up that mess and do you replace the outer seals everytime? Don't have the answer to your question, sorry Thanks

[@rickszabo4312]

@@tt6518 no prob the only reason I learned about this is from 2 major failures I had on the same rear rear diff I o/hauled about 15 years ago at a dealership I worked at. The rear diff breather snapped off flush on the lh outer tube but was still sitting on it, the rear brake line block was holding it over the tube, Anyways the tube was filled with compacted silt . Discard the outer seals, I use a long piece of ready rod with a large flat washer bolted to the end of it. Wrap a rag around the washer and push it through. Use lots of solvent or brake clean. then I have a engine cleaning solvent gun which I hook up to my air line and blow it out. Good quality white rags or paper towel dragged through the tubes and housing will show what kind of a job you have just done, replace outers seals, clean diff breather.

[@tt6518]

@@rickszabo4312 Hello, Nice to get back to me with such infos,I can tell that you like to do it the right way, taking care of details so you have a professional result and it is working without having to comeback. I did drain off my RAM' rearend,changed the 2 outer seals last year and I have never thought of cleaning the tubes Thanks Rick and be blessed.

[@rogerdc7279]

Beautifull ! thank you Brian. As allways you are precise and clear and the videos are of top quality. I have exactlly the same problem on my 2008 F150 I have a couple of questions : - Apart from the metal shavings from the bearings, do the pitting of the bearings can afect the gears by altering the tolerances ? - How much a job like this one, would roughly cost ?

[@blainemcdonald6972]

I have a similar problem with my 2015, eco boost, 3.5 157 wheel base, 137,500 km. 9.75 rear end. Severe vibration at around 95 to 110 km when I let of the gas. It’s loud and can really feel the vibration thru steering wheel. Its got new tires and wheel alignment, balance etc. This video Brian shows me what the cause might be. Can you give me an idea of the man’s hours to perform the repair you showed us. That’s from Edmonton, Alberta, Canada.

[@halleffect1]

Excellent work Brian. Imagine how many parts changers would pull that whole axle with the nice gears and put a used salvage yard special in. and probably charge more.. to get less.

[@Khlandestine]

That was like a punch in the gut reading that lol never again

[@Khlandestine]

It always is some specific thing it’s never wise to just get the junkyard replacement that is worse quality overall, older, been exposed to weather, probably not even original size or year lol

[@Khlandestine]

So true

[@e.b.6766]

You’re awesome!!! Wish I lived closer to you. That’s not a problem… I am willing to make the trip. Will be well worth it.

[@viking.200]

yes, it is often the trip worth to get things done right the first time.👍

[@seanpeloza326]

I am fortunate to live 75 miles from Brian's shop. I can tell you that it is worth the drive. He has mentioned in previous videos, customers even coming from Texas.

[@yoster77]

That fluid looks surprisingly clean for that mileage. Curious if the used lot changed it out and tried adding some additive to quiet the noise.

[@santaclause2875]

Yes, very clean. I recently purchased a 2012 Mustang V6 with the same noise, 110,000 miles. Changed the fluid, all clues pointed to it being the original fluid, the back cover had never been off, the filler plug still had the factory thread sealer. The old fluid came out crystal clear, and the insides of the diff are clean as a whistle. I'm amazed how fluid with over a 100K can look like new. I also suspected that the used lot had changed the fluid, but I found no traces at all that anyone had worked on it recently.

[@JaceJackson]

I have been seeing failures like this recently on the newer 12th and 13th generation f150’s. 99% of the failures I’ve seen have all recently had their differential fluid changed. Now I cannot confirm if they are putting in the wrong weight oil, but I never seem to see failures with people who don’t service their differentials. I’m no saying don’t change your diff fluid, but I’ve seen trucks with well over 200k miles on the differential and requested a differential fluid change and all the bearings looked amazing.

[@JCouch444]

Great vid as usual! I'm having this issue on my 2005 ford expedition. How much should I expect to pay for this repair? Thanks for your help!

[@digitalghost81]

Appreciate the videos. I’m just a DIY dude with a 2000 Expedition 5.4 EB. At 9:55 those rough marks on that part, do you sand it to smooth out the wear or do anything with that part location?

[@mikeclement7780]

Remove and replace

[@rengar322]

that is a pressed in race. it is removed and replaced

[@millstonejeepworx]

Always great videos and content. My son's 2003 Ranger has a bearing noise coming from the rear diff. Not sure if it is the pinion or carrier bearings. It is an FX4, 4.0L w/ 5spd with 4.11s and a LSD. Just finished doing a bunch of work to it included all new rear brakes, axle bearings and seals, and pinion seal. Unfortunately I didn't drive it before starting the work so I was unaware of the noise prior. What rebuild kits would you recommend to get for it?

[@gr8tfoxes617]

Great info. Got a similar noise on a 97 Expedition with 219k miles. Suspect this is the issue as well. Great content as always.

[@ShopGoatVentures]

🙏Thank you for your videos, very helpful. In which order of operation should I start with? Mazda B3000 diff sounds noisy, and there is visible signs of pinion seal leaking. 1. Pinion seal change 2. Pinion bearing inspect 3. Carrier bearing inspect 4 Inner pinion bearing inspect 5. Entire diff gear oil change with reassembly ??

[@dennyclaborn5442]

Huge help!!! Same thing in my 2019 f150 with 231,000 miles

[@kapaul1584]

Could you do a video of the dis/assy of this and how you took the races out/in with it in the truck.

[@FordTechMakuloco]

Yes it is already shot I just need to edit.

[@kindsasquatch9086]

Great timing for this video as I just had the rear diff in my 2018 F150 rebuilt. Can you briefly advise on proper break-in procedures... my dealer didn't go over that part when I got my truck back, which I imagine is pretty darned important. Thanks!

[@kindsasquatch9086]

Asked specifically about this at dealership and they said no break in needed. Just like getting into a new vehicle. Not sure if I’m entirely convinced though… not a lot of confidence in that answer though. Guess it depends on how long you’re going to love your vehicle for.

[@codywichman213]

Honestly i have never rebuilt rear ends, but have always diagnosed the noise as the bearings inside the diff. Diff rebuilding can be intimidating, and if not done right doesnt seem to last long. We always sub it out. That pitting seems to have alittle to do with water intrusion also, ive never seen that in our climate in AZ.

[@jeffreygoss8109]

I’m with you. Diffs are a black art that I’m not screwing with.

[@ChevyConQueso]

@@jeffreygoss8109 It's really not. I'm honestly puzzled why people don't do it more often with all of the fantastic resources we have available now. The key is knowing how to get a proper indicated pattern on the gears, and knowing how to intetpret it. I helped a buddy figure it out once and he's done about 30 now. If you want them to last, you can't just say screw it and bolt it together. Exactly the same as a transmission or engine. I've done all of it, and learning diffs wasn't any worse than the the other jobs. Easier even. But you'll definitely want a shop press, and take the axle assembly out of the car if you don't have a lift.

[@jeffreygoss8109]

@@ChevyConQueso you are better than I. I lack the patience (and probably skill) to get it. I love watching someone do it but don’t trust myself. I guess I have a good jeep/ 4x4 guy local so I have a crutch.

[@Mr2004MCSS]

I have a 1998 Silverado that I bought new and at around 55,000 miles, I started to hear what I thought was some rear end noise. At around 75,000 miles it was really loud so I took it in and the pinion and carrier bearings were shot. I had replaced the diff fluid at 30,000 with Mobil 1 synthetic gear lube. The shop told me to not use synthetic in that rear end and I'm now at 142,000 miles with no noise. He used conventional fluid in it. I had hardly ever hauled or towed anything with this truck and was surprised that I had problems that early. I replaced the fluid in the rear of my 14 Musang GT at around 3,500 miles when I installed the Ford Racing aluminum diff cover and that fluid was totally nasty. Grey with tons of metal particles from what I assume was break in. I'm at 34,000 miles now and may replace it again in a few thousand miles.

[@Khlandestine]

Wow new favorite car channel

[@Bacongrease00]

Previous owner of a 2004 F150, brought it in for a complaint of vibration/groaning when turning u turns from the rear end. Only had like 80-90K. Needed LSD rebuilt, new carrier and pinion bearings, and seals. Fortunately the warranty covered it. I was surprised because I have known the 8.8 and 10.25-10.5 sterling to be excellent axles.

[@christiandrumr5701]

I wish I lived near your shop. My 05 F 150 with 190k miles (maintained by the book by the dealer, looks like new) had a slight pinion seal drip. Brought it to the dealer - diff fluid was still close to full. The dealer replaced the pinion seal. It seemed to have a very very slight whine, and within 1,000 miles of the repair, the diff is roaring. They have told me that my differential must have already been going out, but, I am betting they did the work wrong. It upsets me becase it was silent prior to this repair and was just as quiet as when it was a new. truck.

[@anthonypirrone1958]

It makes sense for the bearing race to have heavy wear in one corner. The gear mesh will load the bearing more in a particular spot due to the separation force of the gear mesh.

[@nathanjames1089]

If I may catch your attention. I have a 2010 Ford F150 5.4L that makes a grinding/humming noise when above 15-20 mph but only while the steering wheel is within 45 degrees of straight. We've replaced the front wheel bearings and it made the noise better, it's intermittent at low speeds instead of constant now, but still present. I do not notice the noise when I'm in 4WD. Steering feels normal braking does not affect the noise and it's constant on or off the accelerator as long as the minimum speed has been reached. Wondering if it's something drive shaft related or more on the steering side since it seems to unload the problem spot when turning. It does not seem to get louder at faster speeds/gets drowned out and it almost seems like I can feel it more than hear it because opening my window doesn't help. Pretty sure the sound is coming from the front. Thank you for making such informative videos!

[@jamesbruno5896]

Interesting stuff Brian thanks for passing the info on...

[@BogusQuacky]

I am a simple man. I see an FTM video, I click the like button. Get the word out there!

[@donaldisrael7147]

Cruising in the ethanol field. That stuff is everywhere.

[@frank23103]

Great video- every time I watch I learn something. :)

[@GoldVP...]

Lol I know that exact junction! Near Bristol. Thought I recognized that property near the end of video

[@richardvila3]

Excellent and probably the best videos out there!

[@richardk6291]

I had a brand new 1998 F-150 with a whining sound from the rear axle. For some reason the noise occurred at about 30 mph and then again at 70 mph. The dealer adjusted the tolerances in the differential, which did not correct the problem. Then they replaced the entire rear axle with a new one from the factory. This did not correct the problem either and they said it might be a design or manufacturing issue. The dealer gave me an extended warranty on the axle. The noise gradually went away, and I traded it at 43,000 miles.

[@TheBigdog868]

I have a 2007 Mercury Grand Marquis that's making the same noise. Those Ford axles can be hit or miss. Kinda like marriage 😂 Thanks for the info. I feel more educated dealing with the shop now that I've seen your video

[@rharden583]

I'm all too familiar with that damn noise. I changed mine three months ago. My '04 has 198000 miles, so really no complaints.

[@calholli]

On my 95 F150.. the carrier actually cracked all the way across one half side-- (and I mean completely broken into two pieces and separated.. Somehow it still held together and drove, but it was talking like pac-man and popping and chattering like crazy under load around corners. I just swapped my ring gear onto another cheap used carrier and used the same shims and it worked out great. That truck went to 320k miles, and then it finally spun a bearing. It was a long bed/ extended cab 5spd manual, but with only the 302 engine-- so it was too much truck for such a small engine; and I towed a lot with it. Was still a monster in 4 LOW though.

[@andrewmasaberg1116]

Must be the production lines at that time cause my rear in my 95 f150 just went up. Thanks for the video

[@vinces8974]

Great video, I would like to have seen you set up the rear axle

[@FordTechMakuloco]

I will soon

[@RR-bt5xv]

good video would have liked to see you set the lash and put it back together

[@Captain1717Q]

Nice work is always Brian thank you...

[@MarkVanTasell]

HE IS TELLING THIS CORRECT (I PERSONALLY CHANGE MY DIFF FLUID EVERY 2 YEARS,AND USE 75/140)9.75 IS A WEAK LINK ON THE 150.JUST WHAT I DO HOPE THIS HELPS YALL

[@siskiyouwoodsman4279]

Looking at the front pinion race and roller wear, I would suspect an out of round bore more tan anything else as the rear pinion race and roller appeared normal for the mileage. Always enjoy your videos very much!

[@Khlandestine]

Your saying the pinion bearing wasn’t the main thing causing the noise??

[@siskiyouwoodsman4279]

@@Khlandestine I should have been more explicit as I reread my comment and see what you’re saying. The front pinion bearing was definitely making the rumbling noise imo, but the slight howling noise was coming from the slight loss of proper pinion/ring gear alignment because the front pinion bearing and race were excessively loose allowing the misalignment of the pinion and ring gear thus the noise. I also thought (from what I could see in the video) that the pattern on the ring gear was nice and smooth, but you can see the pattern was from the toe all the way to the heal of the teeth and a proper pattern would be from the toe 2/3’s to 3/4’ of a contact pattern up the teeth starting at the toe unless it had extreme mileage and it looked like a newer truck. My wife’s suv did this exact same thing and we were the original owners. When I tore it down it took me awhile to figure it out. Front pinion bearing looked like this one for no apparent reason until I measured the race bore with a micrometer and found to be .005” out of round. Took 60,000 miles to rear it’s ugly head. Also on inspection of the carrier housing, you could see a definite scar indicating it was probably dropped sometime during the assembly process. The front bearing is furthest away from the pinion gear so any slight movement (torque) will cause misalignment between the to gears thus the slight howling noise along with the growl sound. Sorry to be so wordy and it’s just my opinion from my personal experience and being a mechanic by trade for 45 years +. P.S. if you read my entire comment sir, you’re a very patient person.

[@Cad1997]

This is off subject for the video and I am sorry. I need some assistance please. I have a 2006 f150 5.4 4wd and I did the timing job with and ordered all the parts you had listed from link with the melling hv pump. Changed all roller followers with the new style also. pulled off oil pan and checked for guides trash in it. Put it back together following your procedure also with all new pulleys, tensioner and water pump. Did the radiator flush and filled with proper motorcraft coolant. Used exact oil and filter you recommended. Truck ran good for almost 2 weeks and then I started getting random misfires. I had also put in new motorcraft spark plugs you recommended. I then put new motorcraft coil packs in. I am getting a rattling sound at start up and also driving until it is warmed up. Using forscan I am getting 1800 f temp on both cats in normal driving not pulling a load. The o2 sensors are showing the exact same readings with no fluctuation on forscan. I remove the cats from the manifolds because of the rattling sound and I saw no broken pieces in cats. Although I do have low flow coming from exhaust and a very gassey smell out of exhaust. I plan to pull throttle body and injectors to clean them and order new cats. I really need some help with forscan and what readings I should be looking at and the parameters I should be looking for to finish diagnosing the last few issues I am having. Your channel is the most informative automotive channel I have ever seen. Your principles and work ethic look to be astounding. I appreciate the how to's you have provided over the years and I hope God is blessing you in the business you run and the help you provide. Any help will be appreciated. Thanks in advance

[@chrissmithz314]

8:00 Wonder what the BMW was in for? Not that I know anything about them, just didn't know you worked on non-ford stuff, assuming it's in for work of course.

[@FordTechMakuloco]

Just the wife visiting.

[@razbuznik]

Brian did you replace any other bearings since you had it apart for preventive maintenance, or just the bad bearing?

[@FordTechMakuloco]

All except the axle bearings which never fail.

[@petediamond7263]

Reg diff fluid changes plus Lucas added has served me well, what's your opinion? If you get that fluid to cling to the bearing that's the trick.

[@WreckDiver99]

I gotta say, I honestly cannot hear that noise, not until you test drove again with the fixed bearing. I've had 6 or 7 vehicles, and all had similar sounds to that initial. I expected to hear something grinding, but obviously not the case here...honestly, from my ears? I didn't hear a problem in the first run...maybe because the mic didn't pick it up? Don't know.

[@bigdaddymak1439]

The mic picked it up for sure

[@WreckDiver99]

@@bigdaddymak1439 That's great...I can't hear it...I'm old...maybe it is "OMG HOW OBVIOUS DO YOU NEED IT TO BE!!!???", but well...I need to HEAR it. I can't. A "bearing" going bad to me sounds like a garbage disposer grinding up bones....not a whine, I've got LOTS of bearings (brand new) that "whine", so to me, that's a normal noise I was hearing...sorry...just really couldn't hear it.

[@bigdaddymak1439]

@@WreckDiver99 doesn't matter how old you are some people have trouble hearing certain frequencies

[@WreckDiver99]

@@bigdaddymak1439 Oh, I know...but I used to be able to hear the gammut...now? Yea...a few too many heavy metal concerts and playing music way too loud, and running heavy equipment without ear protection...At least now when I go see a Metal concert I wear hearing protection...LOL.

[@WreckDiver99]

@Ken S 55 years old...lots of metal...LOTS of metal...did I say LOTS of metal? LOL... Anyway, about 2 years ago I started to hear my blood pump in my ears. Just once in a while...usually when the old pump station was working overtime. Now it's nearly daily. Learned it's a form of tinnitus. Glad it's that form and not the ear ringing kind. BTW: LOTS of rounds sent down range in my day without the proper ears on...darn stupid kids...LOL.

[@chuckytayler8648]

Awsome video!! I have a 06 F150 with 280,000 miles and have the same noise but mine makes a clanking sound inside the diff when I put it in gear. Already changed up joints and idea what’s causing that?

[@andrewcarroll2044]

Hi great vid thank you for the advice Hoping you can help I have a 2020 Ford ranger 6speed auto 3.2 I’m from the uk and I have similar symptoms there is a noise coming from the rear about 40mph with a light press on the pedal but as soon as I take my foot off the noise stops 🤔 very strange the truck has only done 36000 miles it sounds like the ring and pinions you mentioned in the video any advice thank you again 👍

[@Babylionhotshot]

Damn! Great video! That’s exactly what mine is doing and now I know what it is thanks to you

[@thomascox7796]

Speaking of differentials, the spider gears in my 8.8 wore out and they were specific for the Marauder and no one stocked them. Therefore, I went with the Eaton Tru Track . Eaton recommends 80/90W non-synthetic gear oil. The odometer read 189k. I'm not a believer in full synthetic oils. Synthetic blends or conventional for my vehicles.

[@egmac100]

Did you replace the race that was inside the diff housing? Looks like a press fit job?

[@joshrodgers9366]

I got a gmc senoma in my shop right now that sounds that loud when driving 30-40mph. Sad thing is guy just had the ring and pinion bearings and stuff replaced but the shop that did the job did a horrible job and less than 500 miles later it’s making bad noise already. Found out they left all the shims out. Really not good to try to rebuild a rear if you don’t know what your doing

[@Nerffy]

If you do it yourself and you fail at least you learn

[@rusnsc7622]

Great stuff as usual Brian, Thanks!