Trentwood

Ive also got an 80’ cj5 with 3:54’s. i want 4:10’s. Im having a heck of a time finding whole gear sets. Or sets and bearing kits. I know i need 3:73 up carriers etc. i know the rear is the amc 20, and from what i can find it will hold a 4:10 ring and pinion without changing the carrier? And as for the front, my buddy is taking the 4:10’s out of his YJ and im hoping his ring and pinion will work and all i have to buy is a carrier.