which oil to use for diff??
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Member
Joined: Dec 2011
Posts: 208
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From: south florida
Car: 88 firebird convertible
Engine: 305 tbi v8
which oil to use for diff??
hey guys,
since i value your expertise, can someone advise which oil to use for the diff on a 88 firebird , 10 bolt posi rear end?? dont think its ever been done in 200+ thousand miles, so wanted to change it out. also, will that mileage be factor?? the car drives fine doesnt sound like metal rubbing or squeaky..
since i value your expertise, can someone advise which oil to use for the diff on a 88 firebird , 10 bolt posi rear end?? dont think its ever been done in 200+ thousand miles, so wanted to change it out. also, will that mileage be factor?? the car drives fine doesnt sound like metal rubbing or squeaky..
Joined: Jun 2000
Posts: 5,364
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From: Enschede, Netherlands
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: which oil to use for diff??
Hipoïd gear oil, highest visco you can get if you run it hard. Add 2 bottles of GM additive before topping off. Most are in the 80W90 range but you can get thicker or oil w/ a larger spread. I have 75W120
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Joined: Sep 2008
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Re: which oil to use for diff??
80W90 gear oil works fine. If you have the Auburn differential then use 2 bottles of the GM limited slip oil additive. Don't use anything other than the GM additive from your GM dealer. If you have a Governor Lock then just use the gear oil by it's self. You can use a bottle of the additive if it makes you feel better, but it isn't needed.
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