well, the transfer case is either a np 207 or np 231 (check tag), and if its has a manual trans it's an ax15 after 3/89 or GOD FORBID a peugot BA10 if it was built before march 1989. so if its a side split clamshell case (trans comes apart into left and right sides) then sorry about your luck. i had one i my 87 and they are weak as hell - all its good for is a big paperweight or boat anchor. dont rebuild it, replace it w/an ax15 or nv3550 WHEN it goes, cause trust me it will go.