'91 changing rear diff, no gasket??

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Apr 7, 2008 | 07:56 PM

kennedys22

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Instructor

Joined: Aug 2006

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'91 changing rear diff, no gasket??

I want to change my rear diff oil on my '91, 71K miles. I was going to take the cover off to clean the area. The Chevy dealer said there was no gasket replacement. Sold me a ED? silicone style sealer. I am going to use GM diff fluid and one posi additive.

Should I remove the cover plate or just pump out what's in there and replace it? No gasket - does this sound right? Any tips from previous experience is appreciated!

Apr 7, 2008 | 08:03 PM

wayne lowry

Melting Slicks

Joined: Feb 2006

Posts: 2,240

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From: Cleveland OHIO

Correct, there is not a gasket from the factory. If you have something to pump the old stuff out it would be a helluvalot easier.

Apr 7, 2008 | 08:05 PM

CFI-EFI

Race Director

Joined: Sep 2000

Posts: 17,298

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From: The Top of Utah

No gasket is correct. If that makes you nervous, you could always make your own. Most people in the know, add two of the 4 ounce bottles of the posi additive.

RACE ON!!!

Apr 7, 2008 | 08:08 PM

kennedys22

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Joined: Aug 2006

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I asked the guy at the counter about two bottles (thought I had seen this in another post). He talked me out of it. Hopefully I won't have any noise - I suppose I could get some more in later.

I'll go at it - no gasket and all. Thanks to you both!

Apr 7, 2008 | 10:26 PM

VinceAD

Pro

Joined: Mar 2006

Posts: 649

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From: Georgia

I suctioned the old fluid out with a pump I got at Advanced Auto then pumped in the new fluid with the LSD fluid.

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