Bottom line: I'm building a 2001-2003 F150 2wd supercrew, but have found a 4wd supercrew roller for a good price. I'm going to be replacing ALL the stock suspension with aftermarket stuff, the only thing I require is a frame and cab, as well as the brackets for mounting the aftermarket front control arms (2wd). My question is, what are the differences (if any) between the 2wd and 4wd frames? I realize there will be some "extra" stuff on the 4wd frame (torsion bar brackets, for example), but I need to know the other differences, particularly if the front control arms, mount similarly to the frame on the 2wd and 4wd models. Older Chevy (cough, COUGH!) trucks, for example, utilized the same frame with different bracketry on the front. In an afternoon you could switch the spring brackets, control arm brackets, etc, and build a 2wd out of a 4wd frame (or vice-a-vers-a). Any body know if the F150 Supercrew frames are similar?

THANX!!!!

 

The frame itself is the same, the only difference is the suspension and the brackets.

 

2WD FRAMES DO NOT INTERCHANGE WITH 4WD FRAMES
THE 4WD has awelded in cross member in frt
mitch