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Thanks for your help Jim. You're right, I probably shouldn't be undoing the nuts. We'll see what happens

Thanks much for your help. My cover is the same as the one labeled "71-72 Buick" at the bottom of your message. Apparently someone swapped it at some time? One other quesiton- in other forums you describe pinion seal replacement, you stressed that its important to "stake" the pinion nut. I'm not ...

I can't seem to match up the diff in my 1970 Olds Cutlass Supreme. I've attached a few photos. I'd really appreciate any help indentifying it. Thanks