I'm guessing mine has about 3". Stock 51" rears up front, Chevy 63" springs in back. Got maybe 1" of arch at ride height in the front with 2 extra leaves in the pack. 2" drop hangar and 4" shackle under the frame give me the rest of the lift.
There is absolutley no room under there. I originally mounted my steering stab to the top of the axle housing, but the oil pan crushed it. Moved the stab in front of the draglink. The tie rod just barely rubs the front of the 3.0 oil pan. I should put a t100 pan in just incase.
That said, the springs are way too soft. I need to add 1 or 2 more leaves up front. That should give a little more lift, a little more clearance, and a little more spring rate. The front is so soft, the Chevy springs don't even bother to move when flexed up. Hopefully I can get another 1.5" higher, then lift the rear without adding leaves. Then maybe I won't have to tub the firewall for the 37's.