Transmission – Rear-end

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For a 1950 car differential, will gear ratios other than 4.11 and 3.55 fit? Can a 3.36 be installed?
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Guys, I'm changing my Transmission fluid for the first time (that I'm doing it ). What "Type" of Trans Fluid do I need. This is a street/strip 1981 Firebird with a 455 Olds in it. I do race it monthly at the track. I know it seems like a lame questio...