Couple things I should add. When I bought the truck it already had a 5 lug conversion.

Is there a easy way to tell what everything is in there so I make sure I buy the right parts?

I'm assuming because it is a 5 lug conversion and has a posi in it that it's a later model 30 spline set up. I guess I could tear it all down then order my gears.

1963 Chevy P/U: Forged LS1/4L80E swap and big hit of N20 coming
1973 Camaro: Low compression solid roller LS1 with PT91 turbo Built for the Silver State classic
1967 Convert Continental: Stock Cruiser