Need some help

Lifting a YJ there are going to be complications, they only used drive-train components adequate for a car.
In other words, as light as possible. Thank you CAFE regs...
What size tires are looking at?
Is it stock right now?
 
I’m getting ready to lift a 89 YJ. 4 inches of lift. What do I need to do?
You would need:
  1. 4” lift springs
  2. Shocks that are longer and built for a 4” lift.
  3. Slip Yoke Eliminator for the transfer case.
  4. Possible leaf spring wedges to point the pinion up at the transfer case.
  5. Double cardon drive shaft that’s appropritae for the 4” lift.
  6. Longer brake lines.
  7. New gears in the front and rear axle appropriate for the larger 33” tires.
 
You would need:
  1. 4” lift springs
  2. Shocks that are longer and built for a 4” lift.
  3. Slip Yoke Eliminator for the transfer case.
  4. Possible leaf spring wedges to point the pinion up at the transfer case.
  5. Double cardon drive shaft that’s appropritae for the 4” lift.
  6. Longer brake lines.
  7. New gears in the front and rear axle appropriate for the larger 33” tires.
Yup, all of the above, though the springs will probably come with shims.
And if you have the D35 rear axle, ditch it, it's junk.