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gear oil weights

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Yes, that's what they should have in them.


Just FYI... If you have a limited slip differential, it will need a friction modifier additive with the 75-90, but if you were to run a 75-140 or 80-140 Synthetic fluid, no modifier is needed.

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Simpler is to jack up ONE rear wheel with the vehicle in neutral (not park) and the brake off & wheels chocked. Try to turn the rear tire that's off the ground. If it doesn't turn easily (or doesn't turn at all), you have limited slip. If it turns easily, either you don't have limited slip or it's already worn out.

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