Yes it would be possible but it would also be a downgrade.
YJs have a high pinion 30 and the TJs have a LP 30.
You may have to shorten or lengthen your driveshaft.
Another option would be one out of a XJ (Cherokee) They are high pinion too.
Lots of those out there and it would probably be cheaper than the TJ 30.
93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
problem with using a TJ (or XJ, ZJ and pretty much any Jeep newer than 1987) is that they are all coil spring front.
whether you choose to cut off the coil and control arm mounts and weld on spring perches - or keep the coils and convert your YJ to run coils... either way would be a fairly radical modification needed - though modifying the axle would be the lesser of 2 evils, still a bit of work. probably cheaper in the long run to get a YJ D30 and just regear it to the 3.73 gears you're looking for
[FONT="Comic Sans MS"][COLOR="Blue"]Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
[/COLOR] [COLOR="Red"]swap/build thread: [url]http://www.jeepforum.com/forum/f22/after-almost-4-years-finally-my-own-build-swap-thread-1542284/[/url][/COLOR][/FONT]