Here is the way to take the measurements, and I would like to thank Spike for his photos.
Front
Rear
Measure from the centerline of the wheel up (plumb) to the fender lip. Any other measurement doesn't count. 1/4" accuracy is good enough.
*EDIT:* The current base line measurements for 02-03 trucks (fender flairs) is 18" Front/20" rear.
Provide:
Manufacture and front drop type / Manufacture and rear drop type
Measure front/measured rear
Make sure you have atleast 200 miles on the drop before posting
(tire and wheel sizes don't matter)
Front: Drop / Rear: Drop
(Ayrton) Hotchkis kit 1.5" / 2.0" (16.5" / 18.0")
(2002GreyHD150) Belltech 4804/6400 2.25" / 2.25" (15.75" / 17.75)
(503Blackjack) Ground Force kit 2.5" / 4.5" (15.5" / 15.5")
(Dubless) Western Chassis kit 4.0" / 5.25" (14.0" / 14.75")
(03 SCREW) Roush kit 2.0" / 3.0" (16.0" / 17.0")
(dermaestro) JLP 3" shackles 2.5 rear drop (17.5")
(trashguy) JLP 3" shackles 2.5 rear drop (17.5")
( I Drag) DJM 4/6 kit 4.5" / 5.0" (13.5" / 13.0")***stock coils up front w/ 1/2 coil removed and helper bags in rear.
(JK'SHarley) Western Chassis A arms w/Belltech 3" coils 2.25" / 4.0" (15.75" / 16.0")***rear is 2" shackle w/ 2" hanger.(2000 model)