I have a 92 3.1 RS 5 speed manual. Does anyone know the rear end size. I have a posi for a 7.5 but not sure if it will fit. Hate to tear it apart just to find out it doesnt fit. Also, I think it has a 3.23 gear ratio, would a 3.73 be to much for the 3.1 or would a 3.42 be a better gear. Gas mileage is not an option.