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Yes, it will fit.
Yes
No it will not.
Yes. 91-96 impala, roadmaster, caprice, and fleetwood rear end are all the same and will fit with no modifications.
NO
will a read end from a 78 trans am fit uder my 89 GMC seirra
Yes
Actually yes it will. Caprice/Impalas from 1977-1996 Share the same basic chassis. It will fit, also how do I know for a fact? I have a 9c1 rear end in my 88 caprice. Also just about any and all Suspension parts from a 91-96 caprice/impala will work with a 77-90 caprice/impala. However you will now have two different bolt patterns, unless you have a 80's 9c1 police package caprice which I believe did come with the same 5x5 bolt pattern as the 91's caprice/impalas
Since they're basically the same platform, it should fit without much problem.
yes. The only difference may be the gear ratio which could affect your speedometer accuracy
I own a 1980 caprice and a 7.5 posh unit out of a camera will work. 361sbc 450hp no power adders endless DOMES count HAHAHAHAHA
No, it's too wide.