The torsion bars on the four-wheel drive and HD models of the Chevrolet Silverado are used instead of coil springs to support the weight of the truck. Most of these vehicles have a natural rake to them, meaning the rear of the truck sits higher than the front, so when the bed is loaded, the truck sits physically level. If you prefer your truck looks level all the time, you can crank up the torsion bars on the front of the truck to gain an extra inch or two. This should take about 30 minutes to do.
Measure the distance between the bottom of the bed and the ground, then measure the distance between the bottom of the front fender and the ground with the tape measure. Record the measurements. Measure the distance between the top of the front tire and the bottom of the fender lip with the tape measure, and record that measurement as well.
Set the parking brake. Lift the front of the truck until the front wheels are off the ground using the jack. Put jack stands underneath the truck and then remove the jack.
Locate the torsion bar crossmember, which is underneath the cab and runs the width of the truck. Tighten the torsion bar adjuster bolts using the 1/2-inch ratchet and socket, making sure to note how many rotations each bolt goes through and copying it on the opposite side, ensuring each side is raised equally.
Lower the truck off the stands using the jack. Repeat the measuring process from step one again. Compare the two numbers to determine how much the front suspension has moved up. If you need to lift the truck higher, repeat steps two and three. If you need to lower it, repeat steps two and three, except loosen the torsion bar bolts instead.
