Check out www.froadin.com.
I was thinking about a similar swap a year ago. They gave me some very good information about swaping a t-18 out of a 79 into my 84. The site applies to any AMC Truck or CJ. They have a forum where you can ask questions.
Also try calling Hicks 4x4, Im sorry I dont know the number or anyother info about them. I just know they offer a kit that includes everything you need to swap an AMC truck t18 into your CJ.
If you dont mind me asking, how much did you pay for the transmission you bought. I'd like to find out how much the one that is im my truck is worth.
Hope I helped, good luck.