Hummer H3 Transfer Case Service Pt 1

[@robertiams4198]

I have been trying to chase down this issue with my H3. I've done everything from new brake caliper, brake hoses, hub bearings and even replaced the right front transaxle, because it felt like the right wheel was locking up while making sharp slow turns. Not one mechanic I talked to ever mentioned the shift fork issue with H3's......dammit. Now I know the right direction to go. I love the vehicle and don't want to trade it off. Thank you for this.

[@diymechanictv1233]

I'm glad the video was helpful! The (relatively) easy way to test to see if this would be the cause of your symptoms would be to drop the front driveshaft, and go for a test drive. I'd bet good money that the symptoms disappear.

[@roboclub2579]

I believe I have the same issue with my H3. Makes clicking noise when I step on gas while moving forward or backward. I've taken my to Firestone and they told me my engine mounts are broken and thats what's causing the noise and should take it to dealer asap. I told them they are morons because if my mounts were broken, my whole car would be shaking..(I have this on paper)... I did take it to Chevy dealer and they said my mounts are fine but both of my front axles will need to be replaced at $1806.15 for the service with labor. I did do that and car still makes the same noise when I drive. So I feel like I wasted my money! Not one mechanic ever mentioned the shift fork issue with H3's! We need more mechanics like you out there......Wish you were in Florida, I would get my car to you!!! Now I know the way to go. I love the vehicle the same as I did when I first sat in it in 2007 when it was brand new. I'm hoping for it to stay in my family for many many more years...... Thank you for this.

[@Mayes-Villian]

Had this problem with my H3 an your video helped me when i took it to the mechanic i was about to get a completely new transfer case but he saw this an ordered the part dealers are replacing with an saved me about 800 bucks thanks an keep up the good work!

[@themanthelegend7048]

This is why I love gmc, they are so easy to work on.

[@charliegreen5254]

Thanks for these two great videos on why my H3 won’t shift from high lock to high. GMC just told me I need A whole new TCase. Don’t want the nylon fork that’s for sure!

[@MrWeaponlord]

Does it act like it's in neutral when in just 4hi? I'm have the same issue but mine is an 08.

[@Dennis-mq6or]

Great educational video. Thank you...

[@diymechanictv1233]

Glad you found it useful! Thanks for watching.

[@ralf4k]

Very helpful thank you

[@Snailmailtrucker]

The 2006 Hummer H3 calls for DexRon III as per the Chevy Stealership here locally !

[@IsabellaGonzalez-ic9du]

Hi, my husband and I are dealing with our hummer. We have an issue similar to the binding when we turn but some mechanic told us that a 4x4 supposed to bind when you turn. On our way to an appointment today, we were doing 70 in the interstate and heard a loud snap noise and then the truck started really bad as if the axels had broke. So I drove it 30mph home and took it to the same mechanic who gave me the same bs that 4x4's are supposed to bind when you turn. Now he is saying it's my transfer case. So that's how I found your video. Can you or anyone else in this tread help us save a lot of money and time by possibly troubleshooting this problem. When the mechanic and I test drove the truck, so I can point out the shaking problem, he told me to stop and we both got under the truck and he shook the transfer case with his hand and said that we need a new transfer case which seems it's going to cost over a $1000 bucks. I did see him move the transfer case back and forth or whatever that was in the middle under the truck and I also saw a lot of transmission fluid under the truck. Please let me know!

[@Goodsxp]

Do you have front or rear lockers ?

[@senbin]

Hey install use transfer case and it wont engaged to the transmission to lock in the park pawl do you have any solution Thank you

[@maybach300c]

8:22 I don't think it is the planetary gear for low-range. It should be the spur-gear central differential (planetary gear differential), and the shift fork is used to locked the front and rear axle together, (4-High Lock).

[@EDGAR15ish]

How much oil did you put in it? I just took mine apart today but the shift fork is coming in tomorrow. I took my time to clean it up really good my filter screen looks pretty good the magnet had a bit of gunk but nothing that wasnt normal wear so im pretty much going to leave it alone just replace the fork.

[@EDGAR15ish]

Also where did you buy your silicone and whats it called?

[@diymechanictv1233]

I don't recall exactly how much oil it took to fill it. Sorry. Is the capacity listed in the owners manual?

[@EDGAR15ish]

@@diymechanictv1233 i dont have it but today when i opened it it didnt have much oil but it did not have any leaks neither. About the sealant where did you get it and whats the name

[@rickyandritaflowers6085]

Should I be able to spin the out put shaft going to the front wheels when the transmission is in park

[@diymechanictv1233]

Not if the transfer case is in gear, no.

[@valentinamoraga4555]

It’s necessary to put the car in NEUTRO or it can be possible in PARKING MODE?

[@diymechanictv1233]

It is best to do it in Neutral.

[@sarahrizer3571]

I have a 2006 I was hoping it would just be the fluid but I'm trying to be prepared could this be the same issue with the 2006?

[@diymechanictv1233]

It wouldn't surprise me if this were an issue with other models years.

[@Snailmailtrucker]

The Hummer H3 is full time 4wd...how do you propose to disengage the 4wd ? Does this fork switch from 4wd High to 4wd Low ? I have the exact same problem.. just got my new Metal Fork today and I will be replacing it as soon as it stops raining here in Central Oregon... sometime in June or July !

[@dennisminitrail3141]

they are all wheel drive, there is a difference. then you shift to 4wd

[@EDGAR15ish]

Its me again anyway i have another question. Did you have any issues putting the other part on to seal it? Did you have to turn the gear to have it go inside the planitary for a full closed case?

[@diymechanictv1233]

Yes, you will have to turn the gears to get them to mesh properly and line up. I just sealed it with silicone sealant.

[@EDGAR15ish]

@@diymechanictv1233 thanks man

[@EDGAR15ish]

I just want to update lol my hummer is finally working again.

[@diymechanictv1233]

Awesome! I'm happy to hear you got the issue resolved.

[@israelcastillo1143]

Hi, where do you sell the Hummer H3 2016 automatic transmission?

[@NorthwestAdventurerNWA]

The HUMMER H3 production ended in 2010.

[@juanrramirez4742]

Everytime when i turn 2007 hummer h3 on and switch gears from park 2 reverse and back to drive..in between i am feeling like someone rear ended me it is a harsh shift and when i takeoff from a red light or complete stop i feel a shifting pulling on me i keep thinking it is slip yoke idk i got motor mounts replaced pressure control solenoid replaced internal wire harness replaced still same ol issue any help hummer brothers and sisters???

[@diymechanictv1233]

I'm not a ton of help on that one. If it doesn't feel like it is binding and popping when you turn corners, I would look more at the transmission and rear end than I wold at the transfer case. If you suspect that it may be the shift fork that is always locked in, jack up the front axle and try to turn a tire. If it moves freely then the front axle is disengaged, if it doesn't then it could, indeed be the shift fork issue we experienced.

[@LeadfootRC51]

The banging could be a lot of things but the common failures to check on an h3 are: -Front diff mount bushings (one in rear of differential and two at each cv axle output) -front driveshaft joint going from tcase to front diff -worn or broken front diff -excess play (stretched) chain in tcase. To find out what problem was on my hummer, i placed my phone under the truck with video camera recording the undercarriage and shifted from forward to reverse and then watched the video to see what was moving/banging when i shifted. In my case it was the rear diff mount bushing, and there was excess play in front diff.

[@theone9564]

Is that what makes the click noise when you press gas peddle?

[@diymechanictv1233]

It's the IVS, yes.

[@stussels]

would the new aluminum fork not accelerate wear on the old nylon ring?

[@diymechanictv1233]

Apparently, not. It is the updated design proposed by GM, so I guess I'll trust them.

[@warmad2596]

Cheaper to rebuild the transfer case or just buy a new one?

[@diymechanictv1233]

Guess that's up to you. This one was a cheap fix, though!

[@warmad2596]

@diymechanictv1233 guess that's fair. We're about to fix my dad's or least plan on it. He was driving it one day, then heard a lost snap and stated it sounded like a belt flapping everywhere. Guess we are in for a treat. Haha

[@diymechanictv1233]

It's not oo bad a job. I'm betting his chain broke.

[@youradumbass9481]

So.. you replaced the nylon fork.. but Not the nylon ring. you do know after another 100k. the new fork burns through the nylon ring right. FACT. had it happen. I screwed up first time too.

[@fernando10833]

Donde puedo conseguir Mecanico por transfer case humee h3 en Apex North Carolina

[@veronicajohnson9036]

what are you replacing?

[@diymechanictv1233]

The shift fork that engages and disengages the 4 wheel drive.

[@andrewkherrington]

Does the 08 alpha have a plastic shift fork

[@diymechanictv1233]

Couldn't say, sorry.

[@drmh9041]

did you find out if any 2008 models have plastic fork? i have a 2008 doing this same thing but i can get it out of 4WD if i try several times.

[@Bigjamez2011]

I would have done all the bearings while that far into it

[@crtinkering7323]

why in the world would a engineer use a plastic style fork??!

[@diymechanictv1233]

There are a lot of things being made out of "polymer materials" these days that make me ask this question! My best guess is - cost.

[@crtinkering7323]

@@diymechanictv1233 thanks for the video , i believe this is the answer to my problem.