Question about 1996 GMC Sonoma

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4x4 I have a 95 sonoma and it will ot engage in 4x4. Itsounds like it is but the pin might not be going all the way. can u give some advise. Christy

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  • madmax24 Jan 11, 2009

    i have sama problem

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There are two parts to the 4X4 engagement. One part is the transfer case actually shifting into four wheel, and the second part is the front axle engaging.
If you have a manual shift, as long as the linkage is working, the transfer case is engaged and the problem will be in the front axle. If you have an electronic shift, you can determine if the transfer case is engaged by the lights on the switch. If the switch lighting is correct, the problem is in the front axle. If the lights are not correct, reset the encoder motor module (located behind the ash tray, listen for the clicking when you press the 4X4 button) by disconnecting it for a few seconds and reconnecting it. If this doesn't correct the problem, it's probably the encoder motor. (located on the driver's side of the transfer case) After you change the encoder motor you may have to reset the module again.

Front axle-verify the servo (either air or electric) is operating the clutch fork in the axle by removing the cable end in the axle. Sometimes it's a small shear spring that breaks. Otherwise, usually it's the shim kit and/or fork that need to be replaced. Parts are cheap, but it takes some time because you have a lot of parts to remove.

Posted on Jan 04, 2009

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