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I always RTV the cover, but that's up to you. 80 ft/lbs sounds like a lot for diff cover bolts, I was thinking it was somewhere around 30. You need 3 qts 75w140 and 1 4oz bottle of friction modifier if it's a limited slip.
Make darn sure there is no oil draining out on the sealing surface. If there is any oil there you will have a leak afterwards. Someone posted that Autozone sells a gasket. If so, I recommend using a gasket.