After seeing many discussions about the actual amount a NASCAR was lowered, I finally got hold of a 1998 truck factory service manual and found the following -

Vehicle Ride Height - F-150 4x2

Front - Regular Cab - 114mm +/- 20mm (4.5 in. +/- 0.8 in.)

Front - NASCAR ------ 63.4mm +/- 20mm (2.5 in. +/- 0.8 in.)

Rear -- Regular Cab - 153mm - 215mm (6.0 in. - 8.5 in.)

Rear -- NASCAR ------ 118mm +/- 20mm (4.6 in. +/- 0.8 in.)


A - Front Ride height is determined by measuring from the bottom part
of the spindle (inner most part) where the ball joint stud come thru
to the ground.

B - Then measure from the center of the lower control arm inner pivot
to the ground.

C - Subtract Measurement A from Measurement B to obtain Ride Height.


Rear Ride height is a little easier. On the inside edge of the bumpstop
there is a small lip. Measure from the tip of this lip to the top of
the axle tube. This measurement is the rear ride height.