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  1. Rear end - Will it fit?

    Transmission & Drive line
    My son and I are working on his 1980 El Camino. It has a 350 crate motor, and we will be installing a 700R4 tranny. The rear axle is a stock, open diff unit (7.5" I believe). We need to chang gear ratios and install a posi unit. I found a GM 10 bolt from a 1987 Camaro with 3.73 gears and posi...