Plenty of threads if you search, but it's easy enough.
Jack up the front of the truck so the front wheels are off the ground. (use jack stands). Follow your torsion bars back, they are big thick steel rods that go from the front wheels, to below the cab. There will be a 5/8"(i think, been awhile) bolt on each side (d/s & p/s). May need some wd-40, pb blaster, etc to help out, but turn those bolts clockwise equal amounts. As in 3 rounds on the drivers, and three on the passenger. (all trucks vary, but usually the drivers side bottoms out before the passenger, so keep both equal, or you'll end up crooked)