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Old 12-18-2016, 10:41 AM
quaddriver quaddriver is offline
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Join Date: Jan 2007
Location: Moved to Pittsburgh to be closer to Primantis
Posts: 94
GM front axles use essentially a cv or double cardan joint and it could be bad, or the propellor shaft from the xfer case to the axle could have a bad u joint. these are easy fixes ranging from fairly cheap ($15 u joint) to moderate ($100 cv)

Since the mechanical cacophony only occurs in 4/AWD it points to something that rotates only when the system is engaged. It would be hard for me to describe how to fix it here, pictures are worth a 1000 words and there are quite a few you tube videos on the repairs.

the entire system is a close, inbred cousin of the system used for the old S10 blazer, married to the Olds Bravada AWD system.

They have fleas, but they are fixable fleas.

do you have access to a garage and/or a lift? you need the wheels off the ground so you can grab hold of drive shafts and look. Id like to suggest you need a proper brake pin/balljoint/u joint on-car press tool (essentially a giant c-clamp) but you can get by with good sockets and big hammers.

and I know you like doing this stuff yourself but a word of caution, if you can lift up the majority of your tools at once, you aint got the right tool - so proceed with caution. when working ok, these systems are quite competent.
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