I'm looking to put a 9 inch rear in my 1966 coupe and I found a person selling a 60.5 inch rear casing on craigslist. I know the axle is too long but it comes with a third member. The price is quite good but he does not know what the gearing is. Can the gearing easily be changed? he wants $175 for the while package and I know the third members alone can go for a lot more than that. Are all third members different, or universal fit? Oh and can the case easily be cut down to fit the 57.25 inches it needs to be to fit?