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Old 11-15-2011, 04:19 PM   #3
usmcchevy
Has more rust than truck...
 
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Join Date: Apr 2005
Location: Ivanhoe, MN
Posts: 2,421
Re: Noise when slowing down in 4WD

Quote:
Originally Posted by northerngmc View Post
Winter has arrived and I had my truck in 4WD high. I noticed a noise when I let of the accelerator pedal. I put the truck into 2WD and the noise disappeared.

Any suggestions or where to start looking?

My plan is to check the transfer case and front diff fluid.

I did a quick check on the front shafts going out to the wheel and when I gave them a good shake both seemed fine.

Would front wheel bearings only be in use during 4WD?

Truck in a 2004 2500HD lly with 170 000 kms.

I have changed fluid in both the transfer case and front diff in the past 12 months.
Prabably not your problem, but everytime someone mentions a T case problem in a 2500-3500 I think of this:
http://www.thedieselpage.com/reviews/tcase.htm

I would check the front diff, front drive shaft U joints and T case. CV shafts will start popping if bad and wheel bearings are in use all of the time, most noticable going around a slight curve at slower speeds.
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