Gear lube?

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oem6pak

oem6pak

pure stock forever
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What gear lube should i use in my 8 3/4,parts store has castrol 90 weight w/limited slip additive yes or no?
 
FWIW, I used this in my '05 clutch 9-1/4" corporate LS......
upload_2021-5-26_14-45-55.png


It was clicking and chattering all the time with it. Stopped at the dealer for a bottle of the Mopar stuff, got it in, and it stopped all the click-n-chat.

This also works well............

Friction Modifier for Limited Slip Differential/Posi/Suregrip (doctordiff.com)
 
I have always used 80w-90 in the old cars and never had a problem. If its sure grip add the little bottle of whale jizz.
 
Do you HAVE a limited slip, or are we supposed to guess?
 
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