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Correct gear oil 57 cadillac rear diff axle carrier

Started by Carcadillac, August 30, 2023, 11:12:56 AM

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Carcadillac

August 30, 2023, 11:12:56 AM
Hi, I see the manual suggests 90W gear oil, I can get GL-1 or GL-4 oils in 90W, any suggestion on which GL" is appropriate.  It does have some soft metal parts in the unit.  1957 fleetwood 3.36 ratio.

Chopper1942

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September 01, 2023, 09:36:33 AM
I would recommend ACDelco Axle Lubricant 88900401. You can get it at any GM dealer and online. It is a full synthetic gear oil and can be used in posi diffs.
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