i took my 79 f150 out muddin for the first time after owning it for 2 years.9 inch lift,lincoln locker in back and a detroit in front,4.56 gears and a 400m with intake and carb on 38/16.5/r15 swampers made it about 10 feet at about a 20 mph roll and then promptly sank to the point of 4 inches of mud in the cab.4 hours of digging and 3 trucks later i got it out. i have never went muddin since