I am looking at buying a 89 YJ, It has a I6 258 not sure about
trans and transfer case, The gear shift will not stay in first gear
it keeps popping out. any ideas
The YJ is priced right.

You have a peugot transmission. It is a piece of crap. You are lucky to get 50-60k miles out of those. I believe a swap with an AX-15 is a straight bolt on, but you may have to do some more research. I would definately swap something in and not rebuild it.

Good Luck
Chip

I'll second the worn out Peugot. These are junk transmissions, and you will probably not find a good used one. Rebuilding it would cost almost as much as swapping a better transmission into the Jeep.

The AX15 is a direct bolt up, except that you probably have a 21 spline input shaft on your transfer case and the transfer case on the AX15 is probably 23 spline. Solution --- > get the transfer case with the AX15 and swap both in at the same time.

Being a Jeep, the AX15 is not the only solution. There are more swap possibilities for Jeeps than for any other vehicle. Take a look at Novak's web site to get some ideas for other transmission swaps. Advanced adapters Also has a lot of stuff for Jeep transmission swaps.

Or you could put in a Chrysler 3 speed automatic with the AMC engine bolt pattern on it. That's a junkyard find, but the clocking on the transfer case may be off depending on what you pull the transmission from.

Or you could drop a different engine into it and a different transmission at the same time. Small block chevy and a turbo 350?