2002 GMC Envoy 4WD Problem

STARK187

MEMBER
2002 GMC ENVOY

2002 GMC Envoy w/ 90,000 miles. It has a switch that has 2WD, AWD, 4HI and 4LO. The problem is that I put it in AWD when we had a recent stretch with snow. It warmed up and I put it back in 2WD. Now it makes a very ugly noise, usually when slowing down or accelerating. I can put it back into AWD and the noise goes away. No noise present in 4HI or 4LO either. Any ideas?

Friday, January 12th, 2007 AT 11:53 AM

2 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

Sounds like a transfer case problem. Could be its not completely disengaging and thus you get the noise. Those transfer cases are a little more complex than a standard one, I suggest you take it to a shop with experience in the AWD cases

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Friday, January 12th, 2007 AT 12:54 PM

MATHIASO

MECHANIC
1,209 POSTS

Noise problems are more difficult to diagnose and service than mechanical failures.
Before taking the transfer case to specialist, check if the hub on the opposite side of the axle is not desengaging. That can happend when dirt and water enter the hub and contaminate the lubricant.
If noise comes from transfer case, check for incorrect tire inflation or tire size, excessive tire wear,
It many different transfer cases in used today and each has its own features characteristic and servivce procedure. Proper diagnostics and service beging with the proper indentification of the transfer case.
Like Jack said from the begining, take it to spesialists.

Good luck

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Saturday, January 13th, 2007 AT 10:20 AM