Possible transfer case issue........

ffmf2101 · Nov 6, 2015

Hey guys ...... One of my buddies was having some issues with his 07 H3. Couldn't get it to switch to 4 hi or low lock at all. Long story short I fount his sunroof drains stopped up, as well as wet connectors. Got everything cleaned and dried and now it's shifting into lock and back to awd fine.
New problem..........
Shifting from 4 hi lock to AWD it doesn't switch instantly..... It waits until a mile or so down the Rd at 50 mph is switches back to AWD with a noticeable jerk which feels like it's coming from the back end but not real sure. I tried searching and couldn't find anything on the forum like this. Any help would be greatly appreciated.

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digglesworth · Nov 6, 2015

Possibly the plastic shift fork is worn out.

Bigunit · Nov 6, 2015

digglesworth said:
Possibly the plastic shift fork is worn out.

That would be my guess too.

ffmf2101 · Nov 6, 2015

Ok since I am decently mechanically inclined, is that something I can pull the case out and apart, as well as check and replace myself?

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Bigunit · Nov 6, 2015

Yes, but replace the OEM plastic fork with the aluminum aftermarket one made by Dorman. A search on the forum should locate the part # for you.

Bigunit · Nov 6, 2015

...here you go.
http://www.hummer4x4offroad.com/forum/showthread.php?t=10554
http://www.amazon.com/Dorman-600-604-Transfer-Case-Shift/dp/B0083H5C00?tag=viglink27685-20

ffmf2101 · Nov 6, 2015

Yeah I was gonna say after I asked that question I just found some threads on it. Thank you guys.

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woodwardsh3 · Nov 6, 2015

Has anybody replaced there chain while they were replacing the shift fork. and where did you get the chain from.

Happy Hummer · Nov 6, 2015

I'm gonna gander to say electrical issue.

digglesworth · Nov 6, 2015

woodwardsh3 said:
Has anybody replaced there chain while they were replacing the shift fork. and where did you get the chain from.

4speedfunk would be able to point you in the right direction...

Zach · Nov 6, 2015

Bigunit said:
Yes, but replace the OEM plastic fork with the aluminum aftermarket one made by Dorman. A search on the forum should locate the part # for you.

OEM replacement fork is aluminum, they did away with the plastic one

SuperBuickGuy · Nov 6, 2015

woodwardsh3 said:
Has anybody replaced there chain while they were replacing the shift fork. and where did you get the chain from.

run away from that one, the chain is (last time I checked) nearly $600.00. I have a broken chain and broken couple of gears in a t-case I replaced.... it really was cheaper to source another t-case (a 4:1 case)... I keep waiting for someone to break a case, should that happen, I'll piece this one back together....

SuperBuickGuy · Nov 6, 2015

ffmf2101 said:
Yeah I was gonna say after I asked that question I just found some threads on it. Thank you guys.

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about knocking the case apart, I have a transmission guy that still cusses about having to take the adventure case apart.... do get the instructions (as he eventually had to do). It's not a NP203, 208 or 241...

cgalpha08 · Nov 7, 2015

Wait a sec....shouldn't you not be driving at 50 mph while shifting the t-case? I know you can be moving when shifting between 4 hi and 4 hi lock....but 50 seems to be pushing it. Atleast that's what I recall that she manual saying (could be wrong tho)

amrg · Nov 7, 2015

I sometimes shift at 60, no issues here!

4speedfunk · Nov 9, 2015

I can get you any t-case parts you need. Chains run $230.

All GM forks I have found were plastic. I use the Dorman aluminum fork for this reason. If someone knows of the GM part number for an alum. fork...post it up.

CaseyS · Nov 9, 2015

I recall it won't change modes above 45 mph. Try it again at 40 mph and see if you get different results. Consult the owners manual, the lockout speed is listed in there somewhere.

4speedfunk · Nov 9, 2015

Changing modes at any speed above 5mph is crazy.

ffmf2101 · Nov 9, 2015

The mode button was pressed before takeoff... The mode changed on its own around 50 mph

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Bigunit · Feb 4, 2016

4speedfunk said:
I can get you any t-case parts you need. Chains run $230.

All GM forks I have found were plastic. I use the Dorman aluminum fork for this reason. If someone knows of the GM part number for an alum. fork...post it up.

GM does make an OEM aluminum shift fork. Part no. is GM # 19180438
http://www.amazon.com/General-Motors-FORK-19180438/dp/B008Y9248U

4speedfunk said:
I can get you any t-case parts you need. Chains run $230.

All GM forks I have found were plastic. I use the Dorman aluminum fork for this reason. If someone knows of the GM part number for an alum. fork...post it up.

jakesz28 · Feb 4, 2016

I ordered a chain from gm parts direct for about $200 and the gears are $100 each if you chewed one up.

alrock · Feb 4, 2016

jakesz28 said:
I ordered a chain from gm parts direct for about $200 and the gears are $100 each if you chewed one up.

I always seem to take my transfer case failure to the next level, with big holes in the case.

4speedfunk · Feb 5, 2016

Thanks BU...I knew it had to be out there somewhere.

jakesz28 · Feb 5, 2016

alrock said:
I always seem to take my transfer case failure to the next level, with big holes in the case.

I have an electric rear locker and a 4 to 1 low range. I think I hear hells gate calling me.

jakesz28 · Feb 16, 2016

Delete

Possible transfer case issue........

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