Not sure what auto the 87 YJ had in it but if it was the Torque flight 999 that is a solid trans and a good rebuild on yours would be all you need. The TF999 was a very good trans. If you want to go to an overdrive trans and pay the big bucks to upgrade there are options out there. The GM 700R4 would be worth looking into.
The 700R4 is the worst transmission i have ever encountered the 4l60e is a little better but i would not try to swap one behind a 258. You would be better off using an AW4 (if you want overdrive) you wouldent need adapters and would just have to wire up the computer to shift it.
Let me clarify my question
What I’m looking for is a solid automatic trans that I can do some light to medium off road stuff in, must be an automatic as I have a bum left leg thanks to a military injury..I picked up a rebuilt 258 motor thru a friends friend that has was bored out some and has zero miles o in it...
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