im running a 75 DJ5D and doing my 4x4 conversion. I went the route of a dana 300 transfer case on the TF727 3 speed auto it only clocks in one way so its an easy set it puts the shaft out on what would be passenger side. biggest issue was i had to put 4inch of lift (suspension) to make clearance for the forward drive shaft. hope this helps for any other odds and ends and OEM parts i suggest
they have copies of origonal service manuals and loads of parts for the DJ thats all they work on. they are fast and knowledgeable Jerry is a good guy to ask for.