You need to ID your trans first. As was mentioned in your post over on cjoffroad.com, that's very likely a AMC-cased TH-400/Quadratrac setup. It'll take the same shifter setup as a GM TH-400. Non- Q-trac autos are AMC-cased Mopar Torqueflites from the 9xx branch of the family (999 is the most common in CJ's). As already stated, any performance shop or online retailer will have this stuff.
'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff. http://www.jeepskate.net