Google "novack adapters" they got some good reading on transmissions and transfer cases on their site,
I may guess and say on an 83 probably a t176 I wanna say there is a jeep cj info site maybe someone can get you in right direction where it lists cast numbers to help you more. Limited on iPhone here right now.
My shifter lever is straight which I heard some say that is significant of a t176.
Maybe all that helps. Good luck
1980 Jeep CJ7
AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT
1999 XJ CLASSIC
RC 3" front AAL rear