from here it gets rough
Join Date: Dec 2007
Location: Beyond Honolulu
The shifter may be a bit different on an MJ than on a YJ. Since the MJ you mention to be an 89, then it should not have the Peugeot BA tranny, and so long as it is from a 6 cylinder, it should bolt to your engine. The input snout should be 0.590" which should match yours. I am uncertain as to how the T-case will be clocked though. We know that on the XJ it is clocked 10 degrees down from the way it is clocked on the YJ, but that is remedied by re-drilling the 6 mount holes on the rear case. If you have this MJ AX15 trans sitting on the bench rather than still in the MJ, then send some photos of the back end of the tranny so I can see the clocking and I can tell you if it is clocked correctly for the YJ already.
I check Craigslist for Jeep parts every day. I have noticed recently that there have been more AX 15 trannies available on Maui than on Oahu or the BI. Have you checked Craigslist.
One other thought, do you have the NP231 T case on your YJ? Supposedly the NP207 was only used in 1987 on the Wrangler, but you should check to make sure that your Jeep isn't "special." You need to count the splines on the output shaft of your tranny and make sure they match the number of splines on the output shaft of the AX15. This could mean you need to get the T case as well. Someone will need to tell me if I'm correct or not, but I think you may have an NP207 T case which would require 21 spline, and the MJ AX15 will have 23. Even if you don't have the 207, the BA had 21 splines I seem to recall, so make sure you check closely.
Make sure you read those conversion threads I linked til you practically have them memorized. This will prevent a ton of surprises. Jeeps are just full of surprises........
....I'm not smart, but I can lift heavy things.......
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We will be going Metric every inch of the way.
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
You should go to Pirate. I hear they are real smart over there. You'd fit right in.