What's the correct diff oil and additive for a 1983 Pontiac Trans Am

[jayman1]

Hi there

I have a 1983 Trans Am. I do not have the original owner's manual and I'm looking for the correct specifications for the limited slip diff oil and any recommended additives. Any ideas?

Scooter

 

[melsg5]

any of the brand names valvoline, penzoil, etc with a weight of 80w90 or so for a limited slip differential. Get the additive from any GM dealer. Personally I would stay away from synthetics for this application.