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Anybody tell me the difference between the 57 series and the 77 series? Pros and cons since they run about the same price.

I have the same manual and the picture it shows where the drain plug is at is flat metal with no signs of ever having a drain plug there. AllData site today said that the cover must come off for a diff. fluid change. Oh well, off to the dealer to get a gasket.

Looking at others pictures (4wd) where the drain plug is mine is flat metal with no plug. Has me guessing that I have to pull the cover and gasket since no other plug seems to be there to drain.

I was going to start a rear differential fluid change tonight and I crawled under and found the fill plug quick..... but where is the drain plug?? To change the fluid I have to remove the cover instead of having a plug?? Thanx! Guess I'm showing my newbieness. 2003 Tahoe 2wd