rear diff moaning

My friend just bought a 98 blazer LS 4X4 and their is a moaning noise that sounds like it is coming from the rear diff. the noise is their when accelerating but gets much worse when coasting to a stop. has anyone ran in to this problem before, and if so what was done to fix it?

Could easily be loose pinion bearings. Unfortunately, the proper repair would involve a nearly complete check of the gear contact and setup.

There is oil in the rear housing, correct?

My friend just bought a 98 blazer LS 4X4 and their is a moaning noise that sounds like it is coming from the rear diff. the noise is their when accelerating but gets much worse when coasting to a stop. has anyone ran in to this problem before, and if so what was done to fix it?

Here is a site with some good info.
But it sounds like rear end repair time.
http://www.differentials.com/install.html

Good Luck and let us know how it goes.
MT

1.) You might be low on diff fluid.
2.) You might have a dry U-joint (Most plausible)
3.) You might have a bad pinion bearing.

I would say u-joint first. Do you ever hear a big clunk when you put it into gear?

I had all kinds of noises comming from under my 98 blazer... Changed the U-Joints and everything was fine...

I didn't have the right tools to take the diff apart so i took it to the shop. They put a carrier bearing in it and that fixed it. it was about $250. thanks for the help.

I didn't have the right tools to take the diff apart so i took it to the shop. They put a carrier bearing in it and that fixed it. it was about $250. thanks for the help.
Thanks for posting back and letting us bnow how it went.
MT

That's actually not a bad price if the axle is now quiet (they must've got it shimmed correctly).