well i hope your amc 20 and dana 30 holds up. i was going to do the same thing you were but i am scared i would just be wasting my money. now i am currently looking for some dana 44's. let me know how everything holds up with some abuse. how big of tires do you have on it? my stock 30 with open 3.54 gears just stripped all th teeth off R&P the other day so i am down as of now. i was going to weld the spiders together untill it did that.
80 cj5,115"WB,360,th400,4:1 32 spline dana 300,rockwells,44 tsl,xd9000i.