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i used a replacement gasket from kragen that cost like $3 and i used some rtv to hold it in place onto the cover while i bolted everything up! so far now no leaks!
is there anything wrong with running a heaver weight oil in a stock diff?
Don't quote me on this because my memory might be fuzzy, but I could have sworn I read a slight increase (.1) in ET and slightly more fuel consumption. I'd search the gears section, maybe maintenance too, if you need the answer.
I used the 85/140 but can't confirm either of the above.