Get a humming noise while turning, going to replace diff fluid

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Nov 19, 2007 | 01:15 PM

ubnpast

Thread Starter

Burning Brakes

Joined: Jan 2007

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From: Central NJ

Get a humming noise while turning, going to replace diff fluid

I got a noise coming from the rear only while making sharp left turns, sounds like a bad wheel bearing would, Ive noticed that on another site that this noise is related to the diff.. Is it worth changing or is it normal to get this sort of humming sound while turning sharp left hand turns?
The other site I should get two bottles of GM differential additive ($8.26 each, 4oz), and gear oil 75/90 ($29.72 each quart).

The parts guy said I should get 2 quarts of oil and 1 of the additive?

Nov 19, 2007 | 01:25 PM

86GoldProject

Pro

Joined: Feb 2005

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From: Hamilton New Jersey

that sounds like wheel bearing, but you can try changing the fluid first, let us know what happens!

Nov 19, 2007 | 01:28 PM

Goldcylon

Tech Contributor

Joined: Aug 2006

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From: Peoria Arizona.. Resident Gold Cylon

Quote:

Originally Posted by ubnpast

The noise is not normal, and adding the limited slip diff fluid should resolve the problem. Your call on replacing all the fluids but while your there

Nov 19, 2007 | 02:19 PM

ubnpast

Thread Starter

Burning Brakes

Joined: Jan 2007

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From: Central NJ

Ill have to see if its dirty or not, that will be my deciding factor, im not sure if it was changed in the 45k miles that it has on it. Is it correct that it takes 2 quarts to fill though?

Nov 19, 2007 | 11:42 PM

Fuzzy Dice

Race Director

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From: Melbourne Florida

Cruise-In IV Veteran

I had the exact same symptom on my 93...it turned out it was the posi unit gone bad...only noisy when I turned left...

Nov 20, 2007 | 12:06 AM

Dads90

Burning Brakes

Joined: Oct 2004

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From: Pearland Texas

A fluid change should solve your problem, at least its the cheapest option, go from there. Do it yourself and save some bucks, GM took me for a ride, labor was rediculous.

Nov 20, 2007 | 09:00 AM

ubnpast

Thread Starter

Burning Brakes

Joined: Jan 2007

Posts: 1,117

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From: Central NJ

Quote:

Originally Posted by Fuzzy Dice

I had the exact same symptom on my 93...it turned out it was the posi unit gone bad...only noisy when I turned left...

The noise is only coming from the right wheel, and only when I make a sharp left, as if I was turning around.

Nov 20, 2007 | 09:20 AM

conv90

Melting Slicks

Joined: Jan 2002

Posts: 2,238

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From: Milan

Quote:

Originally Posted by ubnpast

Ill have to see if its dirty or not, that will be my deciding factor, im not sure if it was changed in the 45k miles that it has on it. Is it correct that it takes 2 quarts to fill though?

Put the bottle of additive, then the right fluid. Stop when it come off from the filling hole. (you shoul put in about 2 qt..probably less..)
-Beppe-