Can't Get Enough
Join Date: Sep 1999
Location: Cotopaxi, Colorado
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Re: Need advice on a AX15
It isn't that hard, but the first time may be quite a puzzle. The way that the shift rails and interlock pins are designed will take some figuring out. I would suggest a book for the proper order. As far as the brass itself, you will need a press to install the gears. When you get inside there, you will probably notice that the 1st/2nd shift hub will have some wear, and the reverse idler. These parts are expensive, and after you change them, it probably will still want to grind going into reverse. I probably wouldn't waste the money on replacing them, just live with the hard reverse shifting.
As far as making it last longer and stronger, make sure that the clutch is correct, and don't speed shift it.
Your '91 is unique as the piliot shaft is a little different. This brings a premium on the used market, and makes for a nice swap into an older '87 with the ba-10/5.
You may also want to consider pulling the tranny yourself, and carrying it to a shop. Another possibility would be finding a mechanic at a Dodge or Jeep dealer that would bench it on the side. New units are available, but are more expensive than the NV-4500.