I realize that this is an old post, but it might help someone in the future. Look at the first three characters of vin number.
F10=F100 2wd
X10=F100 2wd SC
F11=F100 4wd
F14=F150 4wd
X14=F150 4wd SC
F15=F150 2wd
X15=F150 2wd SC
360- 215@4200 hp, 375@3600 torque