Mechanical- FX4's have standard 4wd, standard LS rear axle, standard skid plates and standard shift on the fly 4x4 system.
Interior- FX4's get standard black interior with carbon fiber trim, Lariats get a chioce of black or tan interior with woodgrain trim and standard leather seats and standard automatic climate control and message center.
Exterior- FX4's got the same H-bar grill as the XL and STX. FX4's got textured black plastic fender flares. Lariats got the same honeycomb grill as the XLT, except it was painted beige and had a chrome surround, they also got smooth painted fender flares and standard heated/signal mirrors.
Colors- FX4's were limited to six colors, bright red, white, true blue/dark blue pearl, black, silver, dark shadow gray. Lariats could be had in any color that was offered except silver and dark gray.
Suspension- FX4's have the same suspension as any other 4x4 150, they just get more off-road oriented shocks. Lariats get the same setup as any 2wd 150 or 4x4 150 does.
FX4's could be had in a regular cab w/6.5 bed and could be had w/ a flareside bed. Lariats cannot.