Nearing completion of my 90 2wd to 4wd conversion. It is a manual that came with 3.07 gears. I found a 97 YJ 4wd AX-15 on Craigslist, re-clocked it. Also purchased a 8.25 rear with 3.55 gear from a 2000 xj. Front axle and np231 from a 98 auto xj. Took the front driveshaft and had it shortened for $39. Rear driveshaft from a 92 2 Wd xj (just swapped out front yoke) New brakes, shocks and now in the process of converting it to obd1 after I install a rebuilt 98 4.0 motor. All this in a year and about $5000 and I'll have a almost brand new 26 year old truck. You should not have any problems finding the parts. Just study the tech section it contains all that you will need to do whatever you want to your truck. Happy hunting!