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Posted on Feb 10, 2011
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2002 GMC Z71 WHEN PUTTING INTO 4WD YOU CAN HEAR TRANSFER CASE LOCKING BUT FRONT TIRES WILL NOT TURN.

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  • Posted on Feb 10, 2011
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Joined: Jan 10, 2010
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Hello tmaxx31190
Start by checking fuse #7 a 15amp fuse in the fuse block under the left side of the dash. This fuse is for the accuator motor on top of the left front axel tube. The accuator moter engages and
disengages the front axel for 4wd and 2wd. If the fuse is good, have someone operate the switch
and check to see if the accuator is working, you should be able to hear it engage or disengage.
If it's not working check the connections and for power at the accuator before possibly changing it.
If the accuator is working, it could be a problem with the shift fork inside the differential. Also, have
someone start the truck and engage the 4x4 then look to be sure the output shaft from transfer case to the front axel is turning. The safest way to do this is to have all 4 wheels up on jack stands.
Hope this is helpful.

  • Anonymous Dec 03, 2011

    my 02 gmc will work in auto4wd but will not work in 4hi or 4lo front drive shaft will not turn when engaged but you can hear accuator working and shift motor. please dose any body know whats wrong with it no chev dealer will help.

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