It varies from jeep to jeep.
*how old are the springs/lift? When did the owner say they were installed?
*how much crap is/was carried inside the jeep?
*is it an add-a-leaf, block, shackle, or rear leaf pack?
*new coils? coil spacers?
*what size tires are on it, and do they rub?
(i.e. if you have 33's on it and stock fenders,
and no rubbing, then yes, you definitely have
a good 6" of lift under there)
*what color are the contol arms? (red, silver, black, etc.), are they steel,
tubing, or are they stamped steel? What color are the coils?
Most of us dont have mudflaps, so thats kinda tuff to judge from.