REar differential chatter and knock after ring and pinion replacement - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 08-14-2019, 06:38 AM Thread Starter
 
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REar differential chatter and knock after ring and pinion replacement

What brand and diff fluid to use 80-90 or 80-140
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post #2 of 3 (permalink) Old 08-14-2019, 08:59 PM
 
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Originally Posted by Rainmaker1$ View Post
What brand and diff fluid to use 80-90 or 80-140
Don't think the brand of fluid is going to help the problem, sounds like I would pull the back cover off and find out what is making the noise.
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post #3 of 3 (permalink) Old 08-15-2019, 09:13 AM
 
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These differentials call for a 75W-140 GL-5 synthetic gear oil. GM part number 89021809. They also call for 1 oz. of GM Limited slip friction modifier. The part number is 89021958. Not sure that the friction modifier with that part number is stll available. 88900330 seems to be the replacement. The friction modifier is actually what helps with the chatter.
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