Question about 2004 Hummer H2

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Hummer h2 transfer case

It seems as if the transfer case is not engaging the rear differential
as is only engaging the front differential. car drives like it is front wheel drive

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  • Anonymous Mar 14, 2014

    hummer wont disengage from 4wd,and sensors are fine. do I need to replace fork in transfer case?

  • Anonymous Mar 14, 2014

    hummer 4wd wont disengage,already had sensors checked they are fine,do I need to change fork in transfer case?

  • Anonymous Mar 17, 2014

    when i back up my hummer h2 i feel resistance in the wheels

  • Anonymous Mar 18, 2014

    Front wheels not engaging when shifted into four wheel drive

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Only way for this to happen on an H2 (AWD) is for something to break rearward of the lockup hub. Take a look at the splines between the intermediate shaft and centerdifferential or even the teeth on the forward sun gear and/or stepped pinion on the center diff.

As long as you have the t-case torn down for repair be sure to upgrade to the new aluminum mode fork (production upgrade to old plastic forks thru end of 2007 or so). You should also upgrade the rear half of the housing to the 2008 version which has a pressed-in rear prop bushing (better bushing and is also replaceable.

Posted on Sep 30, 2008

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2 Answers

What is it that engages front drive. Is it front gear box or in transmission?


Depends on what sort of set up you have.

If there's a transfer case - it's like another gearbox on the transmission - it's the transfer case (I.e a gearbox..) that supplies power to your front wheels.

The transfer case is itself powered by the transmission. You will have a propshaft (driveshaft) running from the transfer case to the front differential.

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the first place to check is then rear drive line "U" joints as fail on a regular basis and can be not allowing the shaft to turn properly
T check for diff , jack up one side and engage a gear
if the wheel spins then the diff is turning but if it makes a bad noise (all will rumble a t a low level in this position) the diff will be faulty
It is possible that a joint flange has come loose and the bolts are jamming on the back of the transfer case housing

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Can 4 wheel & differential be used together


If you have four wheel drive engaged, engine power is routed through the transmission to the transfer case to the front and rear differentials. When four wheel drive is disengaged power goes only to the rear differential.

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