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Re: 1960 Eaton rear diff?
If you didn't pull the cover to drain it, what did you do? just remove one of the lower bolts? Personally I always pull the covers on diffs and have a look. I like to know the condition of the internals and to verify the gear ratio. I always reseal the cover with the correct gasket, although no one else seems to. They typically use silicone. Fill it back up with some 75W90 or similar gear oil. If you do have a posi, you will want to add a bottle of the friction modifier.
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