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fluids in open diff vs. LSD

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My Chilton says to use GL-5 in open differentials, and GLS in limited slip diffs...how do I know which diff I have?

 

The car is a 1990 Loyale, 3sp AT, 4WD

 

Also, it only recommended 85W for areas with colder weather. Does this sound about right?

You don't have an LSD, unless someone put it in there after the car came from the car lot.

 

If you had an LSD, there would be a tag on the diff that said LSD.

 

But they didn't come on automatic cars

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