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64 Cutlass Differential


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I need to replace the cover gasket on my 64 Cutlass differential. When I refill it can I use 85-140 gear oil--or should I us 90 Wt------ as I think that is what is in it now??? I am in Arizona and the temps are normally HIGH------ if that makes a difference. I would appreciate any feed back-----personally I think 85-140 would work fine--but would like other opinions.

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