Just got my Hummer home, drove over 500 miles one way and it ran like a champ. No problems... Until I was about two miles from home. The transfer case basically went out I think. The motor just free wheeled like it was in neutral 4h and 4 lock did nothing. Only 4 Low would get me moving again. Any Idea's? And I wasn't beating on it on the way home either, just 65 mph cruizin down the highway

 

Component Description:
11. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE) Bulletin Number:08-04-21-005Bulletin Date:Apr 2008Vehicle: 2,008 HUMMER H3Summary:
BORG WARNER NR3, NR4 TRANSFER CASE - PARKING LOT SHUDDER, BINDS ON TURNS IN 4 HIGH OPEN, CROW HOP (REPLACE PLASTIC MODE FORK). ( NHTSA ITEM NUMBER - 10025288 )
Component Description:
11. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE) Bulletin Number:08-04-21-005Bulletin Date:Apr 2008Vehicle: 2,008 HUMMER H3Summary:
BORG WARNER NR3, NR4 TRANSFER CASE - PARKING LOT SHUDDER, BINDS ON TURNS IN 4 HIGH OPEN, CROW HOP (REPLACE PLASTIC MODE FORK). ( NHTSA ITEM NUMBER - 10025288 )
Component Description:
11. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE) Bulletin Number:08-04-21-005Bulletin Date:Apr 2008Vehicle: 2,008 HUMMER H3Summary:
BORG WARNER NR3, NR4 TRANSFER CASE - PARKING LOT SHUDDER, BINDS ON TURNS IN 4 HIGH OPEN, CROW HOP (REPLACE PLASTIC MODE FORK). ( NHTSA ITEM NUMBER - 10025288 )
Check to see if your transfer case mode fork (OEM Plastic) has failed. My H3 was towed in yesterday for a in-warranty fork replacement. My symptons were similiar to yours.

 

I would assume that since he posted in the H1 section that he has an H1 and the H3 TSBs won't be of much use to him.

 

Did you ever get an answer to your question? I have the same problem.