I am not a jeep person by no means but have liked them.  I could tell you about gm trucks.  so i saw a tj for sale inline 6 5 speed.  What would i have to do to put 33" tires under it?  2.5" lift and what else?  Drive shafts be ok? You read so much about tail shaft conversions for the t-case.  What all needs to be done?  for 35" tires what is the least you would have to do to run?  

When you lift a vehicle you increase the angle of the drive shafts relative to Tcase and axle. The shorter the wheelbase the more pronounced this effect is. 2.5 inches is not going to break the bank here thought. Another problem is those things tend to have pretty tall gears and get slug like qualities in upper gears if not regeared. And finally, you really do not want to go above 33 with stock axle and you want it to hold up well. Stock axle are not that strong and while they are okay with stock tires and 31's, 33's are pushing it a bit and 35's are flirting with failure if you play hard.  

Running 35's on a TJ you're going to need 6" lift or 4" and a sawzall. A Super 30 axle upgrade in front and Super 35 in the rear, and then truss the axles, or Dana 44 at least in the rear, possiably front as well. As far as gears,4.88's would get you close to stock performance. A cheaper route woulb be to run 33". The only Axle concerns would be the rear D35 and gearing. Plus you can get a away with 4" lift. I have also run 33's with 2" lift with slight wheel rub, but only at full lock. You can solve that with either wheel spacers or different backspacing on your rims.  

So you can fit 33" tires with a 2.5 lift but a little rubbing.  would a 2.5" lift require drive shafts to be longer?  Would it cause a lot of vibration?  

Yup, alot of manufacturers frown on using 33's with ony a 2" lift, but the rubbing is minimal. You"ll get a little rubbing at full lock on your swaybar arms and on your fender wells when articullating, but it's not bad. Another plus to this lift is that it's done with poly spacers that go on top of your factory springs, so the instalation time is fast. You also won't need t-case lowering brackets, dropped pitman arm, or have other drivtrain issues like longer drive shafts and slip yoke eliminators.