Don't bother with the S10 junk. Plenty of Jeep stuff out there.
You can use an AX-4 or AX-5(identical except ones a 4 speed, ones a 5). You can get those from behind the 2.8 V6 or 2.5 I4 out of any XJ/MJ/YJ/TJ. 2.8 and 2.5 use the same bellhousing, same transmissions.
x3 on the external stuff. Internal slaves are junk. I don't know about driveshaft lengths, but if you can grab the trans/T-case-front driveshaft all together, that'd be your best bet. It'll be pretty difficult to track down a stock rear, so if the AX-5 is longer than your auto(I think it is), you'll have to just have your current rear one cut down and re-balanced. If you can't get the T-case with the trans, but IIRC almost all AX-4/5s need a 21 spline long input T-case. Try to get a 231 if you can.
Just an FYI(if you don't know already) before/in case you ask. No, you cannot bolt up a T-case to a 2wd trans. You'll need a 4wd one.