Originally Posted by fropleyquark
The only way to really know for your jeep is to jack up your axle one wheel at a time and see if anything hits before the bumpstop. Keep an eye on your front trackbar/diff cover. Try turning the front wheels left and right keeping an eye on the steering linkage as you lift as well.
Someone else's jeep with the same setup may need them while yours doesnt or vice versa.
you're on the right track...to add/correct some of that
basically do this for each axle:
1. Remove springs.
2. Reconnect shocks and all suspension components.
3. Lift axle up/lower frame down to bring bumpstops to set on the spring pad.
4. whatever hits first, thats how much bumpstop you need.
5. diff cover might hit track bar, shocks might bottom out, brackets might hit someplace, or maybe nothing will happen.
6. a lot will depend on the collapsed length of the shocks.