the amount of lift depends on the tire size. decide the tire size you want and go from there. another thing is if you plan to trim your fenders a little bit or not. a 31/10.5/15 tire will fit nicely ona 3 inch lift. i have a 3 inch rustys lift and love it so far. i would recomned the full spring pack kit over the AAL but the AAL isnt all that bad. steer away from lifts that use a shackle or block because with the stock leaf packs you will get massive axle wrap. also there are other things you may need such as a slip yoke eliminator and cv driveshaft. and with bigger tires its always a good idea to upgrade the brakes and axle. as for axles, try and find a 97+ cherokee with a chrysler 8.25 rear axle or 87-90 witha D44 rear axle as those are the strongest. if you end up with a D35 rear axle or a 85-96 cherokee with the 8.25 axle then you will want to upgrade to a D44 or ford 8.8 axle when going with anything bigger than 31's. some will tell you that the d35 and pre 97 8.25's will hold to a 33 or 35 but they wont for long. plus with a 8.8 upgrade you get disc brakes in the rear.
"Few men are killed by the bayonet, many are scared by it. Bayonets should be fixed when the fire fight starts"
- General George Patton Jr, "War as I knew it" 1947
Wife's/my vehicle: 06 Pontiac vibe awd
Hopefully a jeep sometime in the future