Depends on how mechanically inclined you are.
Manual trans was originally an AX-15. You could put an NV3550 in its place.
Auto trans was originally a 32RH. You COULD swap an AW4 from a Cherokee in. You'd gain an extra gear but you would have to wire it all in. Very involved.
yes
No. They are not interchangeable.
Yes, it should work, as long as the engines are the same
Jeep Wrangler YJ 2.5 engine, trans is a AX5
That is no small job, engine controls, transmission, and running gear are all different, but will it physically fit, yes.
If the engine is the same then it will work.
No.
No.
No.
No.
NO
yes.