Increasing this Truck's Top Speed From 67 MPH to 93 MPH [Cummins Swap Part 26]

I install a new differential and regear this 1995 GMC C3500HD to increase its top speed from 67 MPH to 93 MPH.
High quality, heavy duty puller: amzn.to/2VoS0zz
POWERFUL impact wrench: amzn.to/3itRsAV
Differential cover: amzn.to/3jBtX8l
Build series playlist: • Cummins Swapping a GMC...
Instagram: / waldowelds
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[@gregholloway2656]

My hat’s off to you Waldo, for setting up new diff gears while lying on the ground. Talk about a test of patience! I think your mileage should be pretty good with the Cummins running at 2100 at highway speed. Keep up the great videos. 👍

[@WaldosWorld]

Thank you, Greg! Yeah, it's rough doing precise work like this (that needs to be clean) on a loose sandy/dirt surface. For my own sanity, I need to come up with a solution 😂

[@rv-n-heaven7849]

I can see it now: [Waldo does concrete] A tutorial on how to form and pour a concrete floor in the workshop.

[@billyjoejimbob56]

@@WaldosWorld: Check out KZbin channel run by Bus Grease Monkey... He has done exactly that, and put up a pre-fab Quonset hut for shelter.

[@Hillbilly_Brandon]

mileage went from 5 to 8

[@TheZombiewaffles]

@@WaldosWorld pour a cement slab to start and maybe put up a very tall pole barn/car port and eventually get a bendpak lift lol

[@robb2169]

This has quickly become one of my favorite builds on KZbin. 👍

[@WaldosWorld]

Thank you, I'm really glad to hear that!

[@user-cj7dp3yq9h]

Although I am not a fan of the seats.

[@michaelvan2266]

The hammering bit around 7 minutes had me laughing... out loud.. at work.

[@Overkill14]

Took me forever to find this guy…really enjoying this project so far

[@WaldosWorld]

Thanks, I'm glad to hear it!

[@thatmaverickguy859]

Can't tell if that was a pun or genuine

[@troywhitelock6441]

I love how at 6:52 you're hitting the hammer in tempo with the music lol

[@georgenjoroge2318]

What's the name of the song?

[@police428]

@@georgenjoroge2318 I think it’s somewhere in YT’s stock library :/ not sure exact name

[@uniden03229]

So....this got just randomly recommended to me on my front page. Two things, this video is fucking awesome man, your truck is sweet and your video was extremely interesting to watch, I think I'll go through and watch the entire build now. Secondly, I just about choked on my drink when I saw you merging on to the highway from my hometown, for one reason or another I didn't even recognize the area in your first clip in the beginning of the video so it didn't dawn on me until the end of the video. I was born and raised in that town and lived there for over 20 years. Pretty insane to just randomly stumble upon your channel like this out of the blue, not only a rad truck and build but also someone living in my former stomping grounds with such a rad truck. Keep up the great content man

[@WaldosWorld]

Wow, thank you so much! It's a small world sometimes 👍

[@brabhamfreaman166]

Awesome, Waldo! You’re the very embodiment of the need for right-to-repair. With extra credit for doing it while lying under the vehicle on a first/straw/soil floor. Keep on truckin’!

[@jth1987leb]

I would recommend buying a set of bearing that is from the same manufacturers as your kit. Measure the bearings to make sure they are the same. Take one set of bearings and enlarge the bore so they slide on and off the gears. You can use these enlarged bore bearings to find how many shims are needed and easily pull the bearings on and off as need. When you get the correct amount of shims, lash and mating pattern then install the other bearing set for final assembly

[@ipstacks11]

I saw this technique used in another youtube video, LOL. It seems like it would not only save time but it also potentially prevents problems associated with removing and reinstalling press fit bearings. I have more time on my hands now a days and I want to build an off road vehicle or several. I don't have much experience with drive lines but I am learning a lot here.

[@rudychacon7175]

This is the way

[@4stomper]

Set up bearings all day!

[@howardkeil1526]

I made them years ago for stuff I worked on by just holding the bearings by hand and using a small rotary Stone or sanding drum in a die grinder only taking a few thousands off till it became a slip fit

[@Highstranger951]

That’s what I did

[@szymoozz]

You're an inspiration dude. Thank you for being so thorough with your explanations. A lot of guys on KZbin use videos like these to vent a little or tell you some long winded story about life... Really appreciate it!

[@WaldosWorld]

Thank you very much!

[@bronzeage_222]

Agreed!!

[@JustFishing321]

Dude your doing a fantastic job at this whole thing, I’m a professional technician and I tip my hat to your quality of work sir, amazing video on diff work and that’s hard enough by itself

[@WaldosWorld]

Thank you!

[@Dubsteppinout]

The thing about this truck is that typically it’s harder than it looks to get that simplicity of minimal design while doing quite a bit of work, but you’ve nailed it. Great looking ride that people must take seriously.

[@cg8469]

One of the best channels on KZbin, I like your editing style and just the way you do videos in general. Nothing over the top, don't take yourself too serious, not flashy. Wish you the best!

[@WaldosWorld]

Thank you so much! I appreciate the feedback! 👍

[@cbr600rx7]

I had a early 90s F450 superduty with 5.29s and ZF5 transmission. It was the same way even with overdrive. The 7.3 IDI was screaming at 65mph. But it was almost impossible to stall and would pull almost anything you put behind it.

[@lightningdemolition1964]

I had the same setup in a truck and had to sell it out of state because ,California. I delivered it out of state and that was the longest most tedious 500 mile trip I ever took. Screaming up I 5 being passed by semi trucks.

[@jeffflanagan2814]

I have that now on my 93 superduty rollback 5.13 3000 @70mph

[@chrisadams1300]

I had a 1990 Fsuperduty with the same setup. It was a beast but you didn’t get anywhere fast.

[@PeteT622]

23:57 "who's my master talking to? Is he babbling to himself again?!" Great video, great content!

[@mrheart4242]

If you have access from the hitch on the bed. Place a hose from the hitch down to the fill hole put a funnel in the hose and fill from the top. Use the prescribed amount knowing it is empty. You then fine tune the level from there. It's just easier than doing it from the ground.

[@kyleblume6530]

I love how knowledgeable and caring this guy is with everything he does. Like the flatbed and the gooseneck.

[@jessiej3991]

I have the Dodge NV4500 in my 87 Squarebody along with a 1997 Cummins P-pump 12 valve with 3K governor springs and compound turbos, I had 4.10 rear ratio and I only got to 73mph with it going down hill and now I can easily go past 100+ mph with the 3.21 ratio I put in my full floating corporate 14 bolt

[@daledassel5658]

Did you do the gearset swap yourself or farm it out?

[@SalandFindles]

Man, that truck is mint. The interior is sickeningly clean! I'm loving that pleated headliner bit and I just wanna say that your camera work is outstanding.

[@WaldosWorld]

Thank you very much!

[@adamspivey]

The clocking of that steering wheel would drive me absolutely bonkers!! Lol Great job though!!

[@adamspivey]

Literally 10 seconds later he addressed this issue! 😉

[@Rubbernecker]

Another great vid!! I lived in that part of NH for 8 years and I'm familiar with the highway you did your test run on. Brings back very fond memories!

[@WaldosWorld]

Thank you! It's a nice part of the state 😎

[@billyjoejimbob56]

@@WaldosWorld I was born in Manchester. You must live fairly close to where the old gentleman River Dave built his cabin on the Merimack that was recently burned down. A sad story that just doesn't fit the Live Free or Die state.

[@stilllmkp]

this is genuinely a great series please post more often btw the editing is on point

[@WaldosWorld]

Thank you! My goal is certainly to get videos out more often, but these things take a lot of time!

[@xmo552]

@@WaldosWorld What is your cruising MPG with the gear change?

[@montey1017]

I remember an old timer teaching me how to set up a diff on a 90s C2500 in the oilfields. We took the diff out of the truck with a fork lift and basically did it in the dirt. Good times.

[@bondvagabond42]

Diesel mechanic here, we were always taught that peak mechanical efficiency was at peak torque rpm, so if you have the power to run highway speeds at peak torque rpm, that should get you close to max cruise rpm. Also, don't be too sad about your lack of overdrive, having high gear be direct drive gives you around 4% better efficiency, vs. overdrive. That's an average, the bigger/beefier the transmission, the more difference it makes. Thanks for all the great videos. How did I never notice your sick diamond tuck headliner before? Hah.

[@bbbbbb1243]

I think you need an alignment! Awesome video man

[@Warren_L.]

@6:50 - Your choice of music was perfect!! 😄

[@monkeybarmonkeyman]

21:08 EVERY MAN would probably say the same thing. Good job.

[@zonie1953]

Waldo, just a heads up on those aftermarket diff covers ! Some are not the best choice . There is a good series on them put out by Gail Banks. You should watch if you have time. That was a great jump by Aspen ! My Dachshund Otis can jump jump just like that, up to 3 inches !!😂🌵

[@megaglowz8540]

I second this!! www. youtube. com/watch?v=7AmLbGSvESg&ab_channel=BanksPower "remove spaces of course lol."

[@FishFind3000]

Yea aftermarket covers aren’t worth it. Stick with an oem cover. All tough that cover does look like it’s mimics the oem style and shape so it might be fine.

[@smileyguyz]

That cover should be fine. It's the flat backed covers that become problematic

[@WaldosWorld]

Thanks for the tip! I think I've seen that video and the issue was mainly with square-ish covers that prevent oil flow. This cover is pretty round on the back, perhaps even more so than the OEM cover, so I think it'll be fine 👍

[@BIGTRUCK7.3]

That cover is perfectly fine. It's the square ones that have the issues

[@Nemo_IRL]

There's a truck just like that one, but a 1994 right down the road from me. Single cab, no bed, same mirrors for $1800. I also know where there's a 5.9 with an Eaton 5 speed already attached. The temptation to pull the trigger and bite the bullet is overwhelmed! Cool truck, BTW.

[@jimv3352]

Your choice of music when removing the pinion gear made me LMAO!!! Great Video, very informative, what a PITA! I like to put the race's in the deep freeze over night to make them shrink up a bit and a little easier to install.

[@police428]

Music/ hammer smacks were on sync too! Shows his attention to detail!

[@cameronS523]

You win the award for "Best use of Anvil Chorus". I think Verdi would agree. (Although I don't think they had differentials as such in the 19th century.)

[@dwayno07]

That beat with the hammer was on point!

[@dadgarage7966]

Eaton Trutracs are wonderful. While not a locker, they're a big improvement over open diffs. Quiet, strong and maintenance and uses plain old 80W90 with no extra additives.

[@lynettesava7831]

I don't own a car or know anything about how they work. But I watched the whole thing and enjoyed it.😅

[@jeffreypinder9398]

Great instruction. You have an engineer's mind.

[@iceman45ification1]

Great choice in gearing. With all the torque that Cummins produces, you're way better off using a higher gear ratio. It'll help a lot too on your fuel mileage. Great video Waldo!! 👌

[@WaldosWorld]

Thank you! Another think I noticed is that the ratios just seem to feel better driving around town too 👍

[@rmck6830]

I really like the fact that you explain everything so well. I never feel as though you lost me at any point.

[@megastick9324]

Good job. A little old timer tip, when installing the cover, or pretty much any cover, some all thread in a few spots makes it cake to line up every time, especially in a fiddley spot like that. Run in the other bolts then pull out the all thread and finish. Works even better when lining up a gasket at the same time.

[@WaldosWorld]

Thank you!

[@davidopitz972]

all thread = threaded rod

[@jackel440]

Tat was an excellent video break down on swapping gears. I've watched alot of videos on the subject but this one is very well done. Makes a guy feel confident in knowing he could tackle this project as well. Thanks

[@shawazonfire]

really appreciated the polite "excuse me" after your massive fart! thanks bro!

[@jaronking9484]

Hyped for this build. Can't wait till you button this up with painting the bed and finishing up the interior work.

[@ThePullnfool]

Now you need an exhaust brake on the Cummins.. You will enjoy the extra braking control while descending a hill or stopping a trailer load.. You can do the install yourself.. My wife and I did mine..

[@WaldosWorld]

I do have one, though it's not fully installed yet 👍

[@jeremydoblinger3609]

Great work here on this rear end.. I also don't have a lift and do these jobs on jack stands.. I really like how you built thus truck..it will be a tow rig for many years to come..great truck

[@meatloafsgarage3356]

Really enjoying the channel. Keep up the good work. All those projects while outside in the heat and cold are an inspiration.

[@philmaxwell1858]

You have an amazing ability to make me feel inadequate.

[@miniclip886]

This video was in my recommended section and im not disappointed! Great video all around and for the quality I was surprised to see you have only 33k subscribers you definitely deserve more. Keep it up!

[@decentgarage]

Currently binging all your videos on this build! Love this Build!

[@trentdeemer6404]

You’re doing a heck of a job man! Keep it up, I love seeing you putting love into this.. Definitely one of a kind

[@WaldosWorld]

Thank you, Trent! 👍

[@1leggeddog]

Clicked on your video because i was curious about truck repair Stayed because of the easy to watch content, i learned a lot and the dog.

[@WaldosWorld]

Thank you and welcome! 🤠

[@1leggeddog]

@@WaldosWorld I'm actually going through your whole series on the truck!

[@davidkersey2414]

All that power.. all that engine.. all that fuel.. and in the uk we have huge longwheelbase 2.0 liter vans.. that will do a hundred.. and about 35 mpg..

[@larrygreenwich9712]

And this will drag those vans…fully loaded….with the brakes on, and not even realize that it’s pulling something.

[@medicPerm]

I dont know how I found this channel, but man I love it! Keep the videos coming! Great work, and very educational!

[@joeschlotthauer840]

I put my ring gear in a toaster oven and differential in shop freezer... 12:10, put a piece of hose on the spout, and prop the bottle upside down against the gas tank...

[@johnmortimer7862]

I am amazed that you have the patience and fortitude to do all of that work, yet you have not gotten around to straightening the steering wheel yet. EDIT: nevermind, I just got to the point in the video where you directly address that issue. Lol. Good work!

[@WaldosWorld]

Thanks! 😂

[@blackwidowsm]

Most informative auto channel on KZbin from start to completion of project. With through explanations of each step along the way. Job well done Waldo. Looking forward to the bass expedition 🎣

[@jackpinnell3204]

the music during pinion shaft removal was spot on!!!

[@itsjustme9318]

Waldo this was a very interesting video. I am really looking forward to the finish coating on the new bed. Every Motörhead in the world is going to want this truck!!

[@WaldosWorld]

Thank you! 🤠

[@ronniebenoit4081]

No matter what....that diamond tuck headliner has my vote 👍👍👍👍👍👏👏👏👏👏

[@lionelsilva7356]

very informative and well put together series. i have learned a lot. thank you!

[@51sicboy]

Another great vid. What I find most impressive is that you do all this work yet somehow you stay clean.

[@doubleq1223]

I still cannot believe how clean this truck is!

[@CarburetedKilos]

+10 HP for perceived "Bad Santa" reference.

[@WaldosWorld]

Banging on the pinion synchronized with music? Yep. That movie's a classic 👍

[@jeepindave5464]

Awesome Waldo. You're lucky getting it first shot. The dana axles usually have a +/-(#) from theoretical center that you can use that with the factory shim pack to make a pretty good guess on pinion depth. If you do this often a clamshell bearing puller from ebay for 250 is a life saver. Your speedo is way off on the dash. With your background i would love to see you explain how to setup a Dakota digital speedo calibration box. Good work.

[@WaldosWorld]

Thank you! Yeah, I did get lucky! I'm exploring options for getting the speedo right. I did reach out to a company for a possible sponsorship, though I may just go the computer engineering route and make my own converter 😂

[@whatyoumakeofit6635]

That would be awsome

[@roundsm18]

Do they not make a drive gear to reset the speedometer for that transmission anymore? Chevy Kodiak/GMC Top Kick had a 3116 or 3126 Caterpillar engine, Eaton Synchro 5 or Synchro 6 transmission and used the same dashboard and speedometer drive. GMT530 trucks used GMT400 cabs but the speedometer gears used to be swappable thanks to the variety of medium duty transmissions.

[@tonycarter3496]

I love your work ethic. So inspirational. Keep it up, you're doing brilliantly.

[@mrsmyrr]

Three words - I am impressed!

[@noone-io4yj]

7:04 "Yeah I play in a band" -which instrument do you play!? " *the deferential* "

[@Rolltide830]

I only found the channel recently but it’s the best car channel on KZbin if you want to learn instead of just watch mindlessly

[@WaldosWorld]

Thank you so much!

[@Pinzpilot101]

These Dana axles were installed on Landrovers way back to the series 2A (or rather a rover licence version) The British Army REME - Royal electrical and mechanical engineers...the ones who looked after the vehicles, weapons and other stuff, had a huge jig for training purposes which they lifted the whole axle onto and it fixed into those same two holes and pulled the diff pan apart to allow fitting. (little bit of history).

[@stevesalvage1089]

Yep, top filming again ! Gearing seems just right , and yes love fishing to ! Thankyou Waldo !

[@WaldosWorld]

Thanks, Steve! I'm glad to hear people seem to be interested in a fishing video! 🤠

[@royscarbrough3589]

Great video! Love to see your hard work pay off so nicely.

[@WaldosWorld]

Thanks so much!

[@Lioncycles]

21:04! 😂😂😂😂 Someone’s got gas! 😂

[@25vrd48]

excellent video and explanation of the rear end components and how to correctly install everything . Awesome truck Waldo .

[@WaldosWorld]

Thank you!

[@chrishansen7004]

So this is what Waldo's been doing since he's been since he's been found, heck man just giver the liver and drop a 10 speed in there

[@dustcommander100]

You can do about anything!!!! I've had to rebuild a couple of rear axles because of bearing failures, and it's quite a job!

[@robertkerby2581]

Well done, Waldo! Thank you for sharing.

[@MrSparks701]

Good lord man! Your drive and patience are phenomenal! Great job!

[@WaldosWorld]

Thank you! 🤠

[@alex4alexn]

great filming, really appreciated

[@dustyphillips3166]

Such a good dog. I think somebody deserves a treat. Waldo, you don't get one until that steering wheel is straight.

[@SquareOneForge]

Awesome edit. Glad to have found your channel

[@pr4lviper]

Thanks for put the links in the descriptions of things are a good tools

[@Pinzpilot101]

Oh how much fun I have had with those same bearings and diff seals over the years...🤣

[@monkeybarmonkeyman]

Hey, get a case of PB Blaster, shoot up the nuts/bolts you're gonna work on the day before. You will be AMAZED at the difference it makes. I'd also have used the impact (or a smaller one) to remove that pinion yoke. See, I'm lazy.

[@johnking5262]

That whistle is crazy

[@mphRagnarok]

Waldo, you are one intelligent, articulate, capable, experienced, and handsome young man. Not to mention an awesome youtuber.

[@Bruningable]

Verdi's "Il trovatore" and differential work on an US diesel truck. Interesting mixture! ;-)

[@courier955]

Excellent vid Waldo, only started watching you a few days ago but am hooked. Greetings from England.

[@jk-tk8lz]

I love just held on by rtv just pry it of proceeds to show the absolute strength of good rtv 😂

[@WaldosWorld]

Yeah, I can't believe how hard it was to remove that 😂

[@j5g5c28]

9:05 that was smooth

[@zack9785]

Fantastic video! Great work, when I do diffs I also like to use the old bearings for test fitment and see what shims to use that way I don’t mess up the fresh new one

[@2nickles647]

Yup. I took off my old ones. Took a sander roll and ground out the ID so the bearing just barely slides on. Wash all old bearings. Installed shims and took a measurement. Did the same with pinion. Measured and used old pinion shim. Install all components and took back lash and ran the teeth pattern. Took it apart 2 times. Installed new bearings and shims. Installed new pinion bearing and shim. Came out spot on. Tip..if you do alot of diffs. You can but 2 sets of bearings and use them as setup bearings.

[@Weaponized_Autism]

Splitting maul with that music was absolute gold my man.

[@bgd73]

very intensive task.. well done. Enjoy the real speed gain

[@martindiego6795]

Great video my man keep up with the great work can't wait to see the finish product of what the truck will turn into 🙏💯

[@WaldosWorld]

Thanks, Martin! 🤠

[@nosam5k]

You need to make a Waldo's World channel shirt that says "Click Click". I'd buy 2 lol. Love the build. Thanks for taking the time to make these videos!

[@WaldosWorld]

Ooh, that's a good idea! 🤔

[@gforcekaras]

Clear and concise, worthy of a sub!

[@WaldosWorld]

Thank you so much!

[@allthingsr7283]

Love the alignment!

[@jamalhussain9162]

new to the channel and already a fan of the content and the style to present and explain everything.

[@WaldosWorld]

Thank you and welcome!

[@fredboucher8689]

Using impact gun on taper bearing to seat the race can mark the rollers or face of race reducing longevity . Always try to never use impact on bearings that you are going to use or reuse. That is why you use that brass driver on the race as we want pristine balls and face on race.

[@poseidon5003]

The skill and patience needed to do this, is no less than a superpower.

[@georgef1176]

Your truck looks so good with the filler pieces on the front wheel flairs. I love it.

[@WaldosWorld]

Thank you!

[@stephencooper5040]

The thing I love about the Eaton true trac is that it’s a mechanical locker that drives fairly normal, AND you can just use regular gear oil with it.

[@prevost8686]

I’ve been looking forward to this video. The Eaton Trutrac is an excellent choice.I can’t wait to see you pull a serious load with it the first time.

[@Cheesychicken98]

That music timing when knocking out the middle part is amazing