Hey guys, this is my pretty much stock 99 Z71 5.3 Autotrac.

I noticed last time it snowed that my truck seemed to be making more noise than normal going down the hwy in 4X4. If I remember correctly it did it in Auto as well.

It has 190,xxx miles on it and the front diff was the only fluid I hadn't changed so I did that yesterday, with no effect.

Any ideas or am I just being pananoid.

 

mine makes noise too. it's the gears in the front diffy all chewed up. bought it used with 102,000 miles.
your's could be something different

 

Possible that its the gears it could also be the U joint's being worn

 

my 05 av. has a noise in the front when its in 4wd, I had the cv axles out when I did the ball joints, and they felt notchy and rough, I have a new set to go in, but haven't found time, maybe tomorow. I got the truck with 117,300 now it has 142,xxx, its had the noise the whole time I've had it

 

The front diffs are known to go on our trucks, I know mine is shot. I believe that a retaining clip breaks causing the diff to rock around and eat itself up...not saying this is your problem, but it is a problem that I've heard of before...

 

Awesome...Is there a easy fix before everything goes to hell in a hand basket.

 

Pretty sure that once the diff starts making noise that it will need a rebuild...if that's your problem, might get lucky and just end up needing a bearing or something though...

 

Mine does basically the same thing. But mine makes sound going down the road without it being in 4x4. And when its locked in it makes a clunking noise. Im going to order some new CVs soon and see if that helps but if it doesnt Im gunna try and find a new differential. Anybody know any good places to locate one??