How Jeep 4WD Works

[@therealking6202]

This guy's knowledge is first-class. You know in his spare time he's still wrenching on cars.

[@michaelbrinks8089]

I'm somewhat mechanically inclined, fixed all my own motorcycles and diy fixed almost every car issue, installed new engine in my chevy z24 and truck but wish I had the talent some of these youtube resyomod car builders have.

[@therealking6202]

@@michaelbrinks8089 You're WAY more mechanically inclined than I am! I replaced a radiator hose once. 🤣🤣 (Kidding, I've done more, but nothing on your level)

[@michaelbrinks8089]

@@therealking6202 I suck at computer stuff though & couldn't play a guitar to save my life. Also bad with doing math in my without pen & paper. I like working on my own cars but tried working as a mechanic and hated it. In part because not enough knowledge to do things quicker & was always making mistakes when being pushed to replace parts as fast as possible.

[@speedkar99]

Thanks. And yes in my spare time I like working on cars. Mostly breaking them apart though 🤣

[@therealking6202]

@@speedkar99 That's the scariest part of your videos... When you take a part off the engine....but then you open THAT part up and take it apart!!! Putting things back together is my personal hell!!!

[@BlackheartCharlie]

I've seen plenty of engine tear-down videos, but this is the first one I've seen for a transfer case. Great video - thanks for making it.

[@4G12]

Relatively simple and elegant design, not much to go wrong, yet has excellent performance potential. Use of an electric motor to control clutch lockup was a brilliant move, much simpler and more efficient, even less to go wrong, and if it does break, relatively simple to fix. If tuned correctly, you can basically get an ACD (Active Center Differential) in a transfer case actually meant for serious off roading, with a proper low range. Lock the clutch hard enough and the result is practically locked diff since there'll be practically zero slip and zero clutch wear.

[@chuckh.2227]

I'm a repair shop supervisor I didn't know a toothbrush had so many other uses I might start carrying one around at work Thanks!

[@muhsalihu]

Do you have access to your brother or wife's own?😂😂😂

[@speedkar99]

Better than the pocket screwdriver eh

[@donvoll2580]

Also to his brother shirt & his wife's too I got to laugh ever time he does video,, They are very good though, Thanks

[@rodolfoplasencia9739]

He couldn't lose us with the toothbrush created attention!

[@michaelstrongbow2336]

The cold weather has a 100% effect on power tool batteries. I love your channel.

[@speedkar99]

Thanks...and yes I agree

[@rodolfoplasencia9739]

Expensive yet extremely educational video! I'm half way lost, I was completely lost when I started it but, am seeing the light! Is evident that you know what you're doing, and this for you is like playing with toys, like when we were little! Great job brother! Thank you for the Masterclass!

[@speedkar99]

Glad it was helpful and you could learn something from my video.

[@monkeseeaction21987]

This is awesome. I like how they reduce power loss by using an electric motor for the clutch rather than hydraulic pressure.

[@speedkar99]

I prefer the electric motor too

[@mattwilliams3456]

Man, thank you for sacrificing part of a unit for this.

[@nobatteriesincluded3968]

Amazing to see the inner workings of a transmission complex but interesting great content 💯

[@speedkar99]

I'm glad you learned something

[@billrowan1957]

I give you props for your knowledge and that you freely share it, but your brother gets mad props for the usage he get out of those tooth brushes!

[@markwilliams2620]

Brings back ancient memories of the adult ed trans/brake course I took in '86. Big change from TH400 and Mincie 4 speeds. Still do my own brakes. When I took the Sonata in for the recall on the "security upgrade" (It's a sticker) they tried selling me a trans flush and brake fluid flush. "Did it last year". "You flushed your brake fluid?!". "It's SW Floriduh, man, you need to every 3 years". My girlie tech was mildly impressed 😁.

[@speedkar99]

Awesome

[@JasonLuther1]

You're the best automotive mechanical engineering feller on KZbin. Great job man

[@speedkar99]

Thanks

[@denniselenson560]

I loved my Jeep, some clever engineering goin on in that car, and yes, that purple oil is very special and very very expensive. The snapring tool never gets old, great video!

[@speedkar99]

Thanks. Is the royal purple from factory?

[@denniselenson560]

@@speedkar99 It was a long time ago, but yes, it looks factory, I remember the original Mopar synthetic oil that was specified as factory had this funny color, the one I drained out and replaced was dark matter black from abuse, probably got stuck in snow or something :)

[@jannehokkanen8175]

you can use normal atf. unless u wanna give extra support to factory owners.

[@JohnDoe-gj4dv]

Sir, Thank you for your VIDEOS.....!!! Your ORATION of this Subject is beyond reproach. You make this INFORMATION comprehendable for the Layman. Please keep the message and mission coming.

[@Shadow6a]

That snap ring removal tool, aka grinder, was so precise. 🤣🤣

[@speedkar99]

I love it!!

[@KO-pk7df]

Thanks for doing this kind of video, it explains so much of what I really want to know about how this works. That info is out there on the web but it's so weak it's useless. Before buying or working on a Modern Jeep this is so helpful!

[@grob25]

I took apart a NP205 or 203. It was off a HMMWV. Pretty solid chunk of metal.

[@speedkar99]

Awesome

[@TheMmbeye]

Thank you! I was looking for the part where you held the front output while rotating the input and the rear output rotated. Transfer case.

[@speedkar99]

You are welcome!

[@Nadi-Ger]

I never expected it to be so huge! And what a chain! :D

[@speedkar99]

It's a Jeep after all! I have a Subaru AWD I'm gonna tear into next...we can see the difference

[@Dani_RdM]

That's what she said!

[@milesredgate4596]

Fantastic as always. I would love to see you take apart a Subaru transmission, as from what I just briefly read, it contains both diffs and the transfer case all inside the transmission. I'd be curious to see how different it is from a regular transmission and something with a 4wd setup like in this video.

[@speedkar99]

Yep. I got a Subaru Outback waiting here that tim gonna be tearing into soon!

[@michaelbezoski3096]

Cold will not affect lithium batteries in the impact wrench (I have same M-12/18 tools), "but" where I worked before retiring (old chemical plant, south shore of Lake Erie), some batteries seemed to prefer the shop over the field when it was below 20f. Funny to see snow as its August 1st. Wonder if that portrays whats to come next couple of years. 🤔 Outstanding video as always!

[@speedkar99]

I find the cold affects the batteries on my tools significantly now that it's summer. This video was shot way back in winter lol

[@repairman22]

Great Video!! Very interesting!!

[@helmhamburgerhand]

Always good to know at least somewhat how this stuff is designed. Great vid!

[@rwriters]

Would love to see you take apart a transfer case from a 4x4. I mean an old school part time 4x4 with an H2, H4 and a L4, like an old LandCruiser!

[@deepbludreams]

That's what that is, chain driven transfer cases have not changed in half a century atleast, they just get bigger. A gear driven version of this is the same just with two transfer gears between the outputs

[@rwriters]

@@deepbludreamsso no clutch, right?

[@speedkar99]

Part time four wheel drive Would be awesome.

[@rwriters]

@@speedkar99 yes please! and add the manual and automatic locking hubs too

[@jbartates]

Super concise and informative as always. Thanks!

[@speedkar99]

Glad you enjoyed it!

[@qkhalili]

Great video as usual, this could help you diagnose a problem much better. Thanks.

[@speedkar99]

You are welcome. And yes learning how something works is the first step of diagnosis

[@sethparker4624]

That was awesome! Thanks for dismantling for our knowledge!

[@facundonu]

best mechanics youtube channel by far!

[@speedkar99]

Thanks. I'm not a mechanic.

[@jay26]

Nice video as always. Hope we can get a video on subaru AWD.

[@speedkar99]

Coming soon!

[@ThunderbirdRocket]

Thorough !! Awesome !!! Thanks ! 👊🏼

[@speedkar99]

You are welcome

[@markharris6171]

Great video. Like to see a tear down of the NP231.

[@jbstepchild]

Nothing new to see here but I didn't get dirty that's was worth an like an a sub great job didn't smell a thing

[@jocko_]

Not a Jeep fan but all of this looks well made.

[@deepbludreams]

Transfer cases are one of the few "bullet proof" parts on jeeps, actually managing to break this is difficult, you'll snap your drive shafs before your chains

[@speedkar99]

Its not bad at all

[@Cristobal_Ygnacio_Arriaga]

I wonder how this compares to a full-time 4WD system like my Fj Cruiser. The manual Fj has a torsen differential in the transfer case. It gives you 4 options: H4. H4-lock. Neutral. L4-lock. No electric motor just the lever inside.

[@speedkar99]

The lever likely controls the locking up of the clutch, just like the electric motor has.

[@lernmor2137]

For your batteries, it is best to keep them inside when your tools are not in use at room temperature, which is about 70 degrees or so. The batteries slightly heat up and will remain warm as you use them. There are videos on YT as to how to open those battery packs up, test each individual battery in there, and then replace them if necessary.

[@imfloridano5448]

This must have been recorded months prior cause that snow could be used here in the DFW TX area with the over 100°f temps. It will cool it down a couple degree's. Thanks for uploading at an appropriate tyme🌞

[@speedkar99]

Yep. Makes me appreciate the weather I have now

[@operation4wheelz]

Mate This is an excellent video.

[@speedkar99]

Many thanks!

[@mtnslyr]

Hey, I’d like to request a quick video dismantling slip joints and spider yoke of drive shaft.

[@michaelbrinks8089]

I really miss my 92 4dr 4wd slighly lifted Chevy Blazer. It was actually decent built with above average reliability. With some good all terrain tires in 4wd I could drive through 6 inches of snow on city streets almost like there was no snow on the ground. Cars would be going 15mph in a 40. I'd be going 45mph weaving through traffic. Just gotta give yourself extra stopping room. If I still had it, I'd love to make a pop-up roof on it and do vanlife/travel.

[@speedkar99]

Ah yes...I remember my cousin's 93 blazer when I was a kid. Good old days

[@personalaccount1515]

I love this channel!

[@speedkar99]

Me too

[@BorisZech]

Amazing content. Is this setup more like the Quadra-Drive II or the Quadra-Trac II 4WD system of the Grand Cherokee (WK2)?

[@bytorsnowdog5885]

Entertaining and informative as always!

[@RM-pi4sh]

13:51 what is that...? Any one know this much of coil is for????

[@jonesliuquan]

10:30That clutch looks like one on my old Honda CB400 REVO XD

[@doctor_who1]

can you do a teardown of X Drive RWD AWD system

[@speedkar99]

Sure. Send me the car 🤣

[@EricAmazon]

Hey Speedkar99, any chance you can do a mechanical review of the recent 2020-2022 Lexus RX hybrid please? They're really common cars, so it shouldn't be too hard to get a hold of. Thanks!

[@STONEDay]

Take the tool battery apart. Look up the part number for the cells inside. Then find the data-sheet. It will give you temperature performance curves. 😆

[@KevinMiller-lh9ur]

Cold definitely affects batteries but it’s still summer in MD. No cold here. 😂

[@speedkar99]

No cold here either. Video was shot way back in winter and old got around to editing it now.

[@dittrichc]

Thank you for the video, mate! Any chance of tearing down a Mitsubishi 4G94 one of these days? 😃

[@adey88splace]

Fascinating video, thank you.

[@speedkar99]

You are welcome

[@richardcasey4439]

I have a Jeep so this was super interesting

[@victorwilks88]

We want merch !! 😮

[@speedkar99]

Isn't there a link in the description?

[@Thekidsinafrica14]

The cold weather? Where you live at? I’m trying to get some of that😂

[@avahrintmurth1159]

Nice video 👍

[@speedkar99]

Thanks

[@dantimber]

I accidentally drove my 2023 Jeep Gladiator Mojave on an asphalt highway in 4wd High. I had been on a wet and muddy dirt road and completely forgot to switch back into 2wd. My Mojave has a part time 4wd system and does NOT have a 4wd Auto position. The worst part is I drove about 10 miles at 70 mph with cruise control engaged before realizing the mistake. So I immediately slowed to about 35 mph and shifted back into 2wd. This is my 5th 4wd truck all with part time transfer cases so I'm aware that I may have damaged the internals. I'm most concerned about the chain but realize the gears and input shafts could also be damaged. I'm not using 4wd until everything is checked and fixed as necessary. The truck has about 5,000 miles on the odometer. What do you recommend needs to be done?

[@klauscottonswab2322]

Is it snowing there?? Lol I always wonder what you do with all the parts.. ??

[@maksymiliangruisen4944]

What do you do with all the engine and transmission parts after you disassemble them? Do you sell them or just let them sit somewhere in your garage?

[@speedkar99]

Scrap

[@mohammadrifqisatriamas7311]

wow never thought going to snow in summer

[@speedkar99]

Who said it's snowing 🙂

[@Aleks_Mechanics]

Notification SQUAD!!🔥🔥🔥

[@speedkar99]

Awesome thanks

[@olspanner]

Battery seems fine to me, you're as fast as ever! lol

[@speedkar99]

Nah it just couldn't cut it in the cold. Now that it's summer I definitely notice me not running to change batteries as frequently

[@billynomates920]

i actually understood all that for once! 😃

[@noahwyatt9260]

Hey man where do you get all your engines and transmissions from you have fun with? Id like to break into some stuff to learn for fun aswell.

[@speedkar99]

Marketplace... people selling swapped engine cores , or I just buy the whole car and part it out!

[@vivi_75]

Yay a speedkar vid

[@speedkar99]

Yay!

[@LeavingCaladan]

hey speedkar, were/are you an automotive tech? or engineer? and what do you do now?

[@sornewp]

what is the partnumber of the trans case ?

[@DaDaDo661]

Cold weather? Its summer bro where are you ?

[@speedkar99]

Living in the past winter still

[@timtim8468]

I'd like to see a visco clutch. The old Volkswagen had them, people are crazy about getting Bulli - 4WDs, when it's actually a cheap a** solution, like the small Suzuki use today. My point, 4WDs come on different levels.

[@speedkar99]

I have another video on the G35 AWD. That one uses electromagnetic

[@thatoneotherotherguy]

It sounds like this is a "full time 4WD" setup, which for 2018 probably would've only been on a Sahara-trim Wrangler? Would be nice to see how simple the more traditional "part time 4WD" is on JL's. I would think that the part-time only transfer case doesn't have computer controlled components? There's no variable torque split in those--when you put it in 4hi or 4lo, you're getting 50/50 front/rear power split, period.

[@speedkar99]

Yes. I mentioned this further down in the video. Older models just have the collar engaging and disengaging the 4WD. Would be cool to open one of those some day.

[@thatoneotherotherguy]

@@speedkar99 not even older models, just many of the current models. To my knowledge, a Sahara gets full-time 4WD as standard, and you can optionally get it in a Rubicon. Other models just get the traditional part-time 4WD. My buddy just picked up a 2024 Wrangler Sport. Has part-time 4WD, but really wild is the manual windows.

[@Wiggywom]

​@thatoneotherotherguy I went with manual windows, too many trucks of mine have lost all windows due to switch failure.. (they ain't cheap either) and once an AC fails here in south texas you won't survive the heat inside.

[@moemanm1202]

What is the part number of that transmission

[@mugenlee8276]

So ...how long the inner chain last ?

[@calixtoemilio]

Having this problem. 2WD is not working, there is a weird noise, even in P. But if I switch to 4WD, vehicle moves "normally" (can promise will do in the long term) and no weird sounds. What could trigger that?

[@speedkar99]

It should be backwards As you see here, power is always sent to the rear wheels...

[@calixtoemilio]

⁠@@speedkar99, that is what triggers my curiosity. Makes sense that 4wd is moving front wheels only? Or that linkage selector is not going exactly to 2wd?

[@calixtoemilio]

clarification: the cranky noise is in "D" and "R", not in "P". Found another curiosity. In 4WD, switch to "R", open the door and autoparking gets enabled , "R" flashes and the rear shaft stop spinning, in 2WD, open the door, autoparking is not engaged , and rear shaft keeps spinning (emergency brake applied) Sorry for the inconvenience. I am in Babb, MT, nothing near to help, will tow the jeep with my RV to a next location with some local facilities available, including a couple of Jeep Dealers. Just trying to satisfy my curiosity.

[@hedydd2]

How did you find cold weather at the end of July?

[@speedkar99]

Editing this now was a reminder to enjoy the weather I have now.

[@davejones290]

Thanks for that,

[@speedkar99]

Welcome

[@canadatransistor]

that's a pretty smart pair of pants to go along with the smart toothbrush! #Smartypants

[@Walkeranz]

Nice snap ring tool 😅

[@buddyrojek9417]

Chains stretch , big problem in second hand jeeps. In my opinion get diff locks without a chain system for all wheel driving

[@ike2010]

Would like to see the BMW xDrive system in comparison

[@speedkar99]

Me too

[@johnharrisjr.351]

Yes, to everything that’s happening here… Yes!

[@speedkar99]

Yes

[@rdallas81]

T 34 tank with v 2 engine used the 3 bearings on a plate to activate the clutch also. 1930s technology Soviet Union.

[@Enigmaafk]

Nice 😊

[@speedkar99]

Thanks

[@nickchannel5364]

It's hilarious that you take your family ’s clothes to use for shop rags. It makes your channel stand out from the rest.

[@speedkar99]

Haha Stand out Lol

[@DM-hw4cr]

That transfer case is known to burn out from running unevenly worn tires!

[@speedkar99]

That's if it's a part wheel drive system without a clutch in fluid.

[@mikekokomomike]

You were referring to flat towing with all 4 wheels on the ground. I learned you shouldn't tow a Jeep with the back wheels on the ground even if you have the transfer case in neutral.

[@omegarugal9283]

depends on the model, check the manual or if the tcase case says N-tow then you can. for long distance towing just remove the axles to be sure

[@mikekokomomike]

@@omegarugal9283 thanks, I figured there were exceptions. I found out that some you can't, brother in law has a JK Rubicon

[@jamsbong]

I prefer the full time AWD of the Audi Quattro because it is fully mechanical.

[@speedkar99]

I'm gonna see what symmetrical Subaru has too, I've got a transmission next on the list for teardown.

[@IKnewMickey]

Question. Is your brother missing a transfer case?

[@EnergySeeker]

amazing as usual thank you

[@speedkar99]

You are welcome

[@JamesLee-oe7mt]

It's cold somewhere?

[@speedkar99]

A few months ago ha

[@joebaucom4537]

Great !

[@tanawatkrubb]

'snap ring remover tool' LOL

[@cernejr]

2018 Jeep and already getting scrapped?

[@speedkar99]

What to do...

[@n5sdm]

As a mechanic that has years of experiance working on jeeps and as a certified elevatortechnician. Do not ever touch my vehicle!

[@speedkar99]

I'm good at breaking stuff. Not very good ay fixing stuff 🤣

[@n5sdm]

@speedkar99 spent my life fixing others fixes. 😆

[@fjb4932]

n5sdm, Deal. Fix it yourself. ☆

[@EIRK2046Y]

the chain is the weakest point of the distributor

[@speedkar99]

Clutch

[@kelvinjaphet]

veiwer no 1😚😚😚😚😚😚

[@speedkar99]

Thanks

[@عبداللهالعميري-ط2غ]

watch model

[@SirajKhan-pt5rc]

👍👍

[@glock18supercharger]

😊✌️

[@javieracevedo9352]

That trannie looks like a 42rle, same one my Jeep Liberty has

[@speedkar99]

850re. See my other teardown video on it

[@rinse3x]

U should do some diesels

[@speedkar99]

Ok

[@JCVACCARO]

On the Jeeps with quadradrive 2 you must replace all 4 tires. If you replace only 2 or have 2 different sizes it will destroy the clutches in the transfer case. If all tires aren't the same height the computer will think there is slippage and be constantly engaging the clutches. How do I know this? I personally blew one up by getting 2 tires instead of 4. Whoops. It is in the manual. Spread the expensive words.

[@speedkar99]

Ouch!

[@speedkar99]

How much did it cost?

[@JCVACCARO]

@@speedkar99 3600$ 6yrs ago

[@JasonLuther1]

Yes sir, same with any awd setup. Sometimes we learn things the hard way

[@alexkram]

​@@JasonLuther1there are different types of AWD systems with different pros and cons. My '98 Jeep Grand Cherokee has a NP242 transfer case with a center differential when in AWD mode. Different sizes wheels won't hurt it and there are no clutches to wear out. It sounds bad to have an open center diff off road because if one tire loses traction, the other 3 lose torque. However I have found it works extremely well and only rarely need to use the part time 4WD mode that locks the center diff. Works especially well on snow and slippery gravel roads.

[@estudiom142]