sinkrun Posted June 5, 2013 Share Posted June 5, 2013 I need a auto transmission for my 89 MJ 4x4 4.0. I have had several offers for newer ones. What do I have to do to put a newer 91 up transmission in? I know the splines are different what if I put a new Transfer case in it will my shafts still fit without modification? Also what about the electronics? Link to comment Share on other sites More sharing options...
skidoo_j Posted June 5, 2013 Share Posted June 5, 2013 It is possible your output shaft is a 23 spline. The transition was 89/90 as they changed over to the ax15 manual. It really depends on the build date as they used up the transfercases that were 21 spline on the aw4. Some references claim the aw4 didn't go to 23 until 91 when the ho motor arrived. As i was told the only way to find out for sure it to pull it apart and count, then measure. regarding a newer aw4, my guess is you'd be able to transfer electronics over. Looking at parts for a rebuild i don't see very many differences other than the sensors. Link to comment Share on other sites More sharing options...
relyt120 Posted June 5, 2013 Share Posted June 5, 2013 http://naxja.org/forum/showthread.php?t=1053970 Link to comment Share on other sites More sharing options...
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