Installed on my 1993 F150 4x4. Fits without problems, but the lower support profile differs from the stock springs. I measured my bumper before and after and the bumper went up 3 inches, should have 2 inches of spring sag and 1 inch of new springs (the forums say they are basically 1 inch balance springs). The camber got a bit more aggressive after leveling out, but after 500 miles of tire wear I didn't notice any issues. Beware, they can cause other problems - I feel the same way with new ball joints. Edit: Looks like they don't! Fits 4x4 exactly. With the wrong spring they will not sit properly. You can tap hard. It would be another couple of hundred miles before the perch had a problem.