The basic premise is the same between the years, but you would want to get all of the peripheral pieces from the 04 also since they changed some of the exact mounting locations on the block between years. Also it would be a good idea to get the computer and wiring harness from the 04 if you could also.
Can we assume that you have a 4.0 right now in your 98? Or do you have a 4 cyl.?
President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
Hes in Illinois, they have more mud there than rocks right?
If your big into mud or water, keep the manual. If your big into rocks, and dont see water or mud very often, swap for an auto if you want, but a stick wont kill you either. More personal preferance now that we have those hand throttle things.
my .02 but I dont play on rocks since theres none around
NO WAY. The AW-4 Is way to complicated for swapping. Yes, It fits, but its a PITA. Do you REALLY need an Overdrive in a TJ?? If you do, then just get the 42RLE in the 04+ TJ. Look at the BS Stu went through just to get an Overdrive.
ASE Master L1 Certified since '96
00 TJ, RockKrawler Pro 8 Coil-Over Stretch Kit (104") and some other "stuff"....
07 JK Rubicon 2 Door, RockKrawler 5.5" Long Arm "X" Factor lift kit, 5.13 Gears, AO Emissions canister skidplate, 1310 U-jointed driveshafts, 37" Mickey Thompson Baja Claw tires on Walker Evans beadlocks, ORF Front bumper, Olympic Rock sliders, Alloy USA front Cro-mo shafts