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I put a new Auburn posi in my 8.5 rear and after a few months some noise started. This happens mainly while backing up slowly and turning.

I changed the gear oil and posi additive and after a couple weeks it started again. Is this normal for a cone type unit?

Should I try switching to 140 gear oil?
(using 80-90 weight now)
 

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I had the same problem with a 9" Auburn pro series posi in my 55 chevy. I switched to synthetic 75W140 and added a small bottle of friction modifier from ford motorsport.The problem never returned.I've heard this is a common problem with Auburns.This fix worked for me. Good Luck.

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69 Camaro SS 350 4 speed
86 Monte Carlo SS
 
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