Chevrolet trucks and SUVs are manufactured with torsion bar suspension springs, which have the advantages of adjustment bolts and compact size. The adjustment bolt can raise the idle height of the loaded spring, effectively raising the vehicle's height. It has the disadvantage of wheel misalignment and a rough ride. The average backyard mechanic can raise a Chevy in about 20 minutes.
Raise the Chevrolet behind the front wheels at the frame rail with the floor jack. Place the jack head at a frame rail and pump the lever until the wheel is in the air. The object is to relieve weight on the torsion bar, which makes it easier to adjust.
Place a jack stand for support on the same frame rail, near the floor jack. Do not place the stand or jack on the suspension or body. It will not be necessary to remove the wheel.
Locate the torsion bar frame mount, directly behind the front wheel. It is typically in the same area of the transmission, where the frame bends to accommodate the shape of the body. This mount connects the torsion bar to the frame and has the appearance of two square braces. Viewing from underneath the mount, a large nut can be seen between the braces.
Mark the nut's location with a grease pen, making a line across the head of the nut and a line on a brace for reference. Use an 18mm socket wrench (for most models) and turn the nut clockwise for one half turn. Every full turn of the nut in a clockwise direction will apply more force onto the torsion bar, lifting the vehicle when it is lowered. Turning the nut counterclockwise will lower the vehicle.
Remove the jack stand and lower the vehicle from the floor jack. Repeat this process on the opposite side torsion bar adjustment bolt, as they must be equal for stability and safety.
