1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Diff Lube: What Weight Multigrade?

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Old 01-13-09 | 11:02 AM
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Diff Lube: What Weight Multigrade?

OK, this is probably a simple question, but for some reason I can't find the answer.

The lube spec for the stick differential on an SA is GL-5, SAE 90, for ops above 0*F.

But nobody apparently sells single-weight gear lube any more; everything I can find is multi-grade, multi-weight.

What's the correct lube choice for a stock, non-LSD diff, especially one that's getting older and a bit sloppy?
Old 01-13-09 | 01:39 PM
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Related question: what's the operating temperature of a differential, anyway? Do they actually get very hot?
Old 01-13-09 | 02:13 PM
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Get some redline 75w90, thats what I run.
Old 01-13-09 | 08:30 PM
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Cool

i am pretty sure they don't get hot, they prob stay colder in the winter city driving maybe warm a Lil bit considering the LSD clutches inside and don't get any hotter then a summer day ive lifted cars and felt diffs after just running nothing dangerous
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