ok what did I miss. Maybe ill just take it to a shop and have it done

 

I think he may be new to this so don't give him too much trouble. I am new to cherokees also, but the Cherokee is a unibody vehicle not a body on chassis so you cant do a body lift.

 

I mean to edit my post but my computer decided it was time to install updates. XJ/ZJ/WJ etc are all unibody.

 

Ok here's what you need to know: 3" you will need a tcase drop and maybe shims, 4.5" you could use a tcase drop maybe or sye and cv driveshaft, 5.5"+ sye and cv driveshaft.

 

Go to ebay here is a link for an angle finder http://www.ebay.com/itm/Magnetic-Bas...item3a6e619847 ..... Now let me try to explain how to do this....use the angle finder to find the ange which the drive shaft is at ...write that down ...now on the rear axle, each rear axle has that metal lip that is parallel with the pinion, set the angle finder on that, get the angle ,write it down ....subtract the lower number from the larger number and that is the degree of shim that you need to to put under your leaf spring to adjust it .. I was told to do it this way and it worked for me .......

 

Obviously your new to all of this so...
Jeeps are unibodys, which means you cant install a body lift. You can however use a BB which is what i initially thought you meant. They are just spacers that mount between your coils and the body. If you go anywhere above 4.5" of lift i would highly recommend long arms. It is easily do-able on short arms, but it will ride awful and your passengers will hate you. Some people do need an SYE at 3.5" of lift, others dont need them even up at 6" of lift, every jeep is different. Anything above 3" of lift you will need a new trackbar and/or drop bracket-or else your front axle will stick out farther on the drivers side.
On the driveshaft and rear pinion angle..
You SHOULD have a single u-joint style driveshaft in the rear, not a double cardan style (front driveshaft is double cardan)
For single joint style you want your rear axle pinion centerline parallel to your t-case output. Meaning, if the rear output on your t-case is 0*, your axle pinion centerline should also be 0*.
If you have a double cardan style shaft like the front, then your pinion centerline should be parallel with the Driveshaft (pointing directly at the t-case output). So if your t-case output is 0* and your driveshaft has a slant of -7* then your pinion should be -7* as well. Shims adjust all that, the proper shims should come with the lift.
I have never seen a reason for a t-case "drop". If your lift is setup properly you should have no Vibes without one, its like saying a steering stabilizer fixes DW. Hope all this helps, its all alot simpler then people make it out to be.