just a note on this, i had a '96 f-150 4.9l, 5-speed 4x4 2.5 exahust, cold air intake, 31-11.50-15 super swamper tsl's that out pulled my buddies 1999 chev 3500 4x4 dully ,auto by at least 50 ft. i was in 4-low 3rd gear.it was not a "measured pull" on a clay track but it happend and i beat him hands down. no idea how or why but i did.