dumb question

My 99 cherokee measures 31" from the ground to the bottom of the fender edges in the front and 30" on the rears. Is that how it should be our am I sagging in the rear? Sorry for the dumb question but I searched and no luck

In the FAQ and Write Up section:

http://naxja.org/forum/showthread.php?t=912893

This should help you determine (factory) correct height.