...Some transmissions came with a .590" bushing and others came with a .75" bushing. I think the 89-91 had one size and the 92-99 had another. I can't remember which was which though.
Also some used a bushing and others used a bearing.
I am thinking on this one it is standard a bushing from what I was looking at. It appears that my AX15 would be the .590 and the motor is .75. The existing bushing is a bushing within
a reducer bushing so I am thinking that I may need two parts and not just one.
This is from another forum. Don't know how much help it is:
The 53009180AB pilot bearing will work with the AMC 258 crank & '92-'99 AX15, but it won't work with the '89-'91 AX15. You need pilot bearing 33004041
I think that will help a lot! Pilots don't cost very much and my GUESS is that I should measure existing parts, order both, and mic them at the parts store to confirm a match. I might go the local NAPA on monday- the sharpest parts counter person out of the four dealers in town is the woman at the NAPA dealer. If anyone can make sense of this she can. She has solved tons of boat motor, toyota, and nissan part issues for me over the years.
FWIW I have learned enough in the last week and today that I realize some of my newbie questions have been rather lame. Thank you and everyone else that has been feeding me information. Although I may run into a surprise or two, after my last week on JeepForum I /feel/ like I have pretty much everything covered. Turning wrenches will bring out the details but I don't think I will have any surprises. I have a manual on the way to fill in the details, but the "overall" segments of my project YJ have been helped tremendously by reading on this forum.
At this point my unknowns are pretty much summed up in not knowing exactly where to reweld the frame mounts for the motor mounts, the driveshaft needs, and what parts of the wiring harness I need to jumper for the starter, ignition, and gauges. These will reveal themselves when I lower the motor in and figure out what matches what. (I was going to eliminate the factory YJ/2.5 engine harness and make everything clean but I have decided to put that off just in case I get crazy and actually go for the 4.0 install next year. Not likely, but hey! It's not going to be a shiny show jeep so why should I care about the 'spare' wires?