The front suspension allows each wheel to compensate for changes in the road surface without affecting the opposite wheel. Each wheel independently connects to the frame with a steering knuckle, ball joint assemblies, and upper and lower control arms.

Two tie rods connect to the steering arms on the knuckles and to a relay rod. These rods steer the front wheels.

Rear wheel drive 15/25 series pickup and 25 series Suburban/Yukon XL models have a front suspension that consists of the following components:

The upper part of each shock absorber extends through the spring pocket. Two insulators and a nut secure the upper part of the shock to the frame. Two bolts secure the lower part of the shock to the lower control arm.

A spring steel stabilizer shaft controls the side roll of the front suspension. This shaft is mounted in rubber insulators that are held by clamps to the frame side rails. The ends of the stabilizer shaft connect to the lower control arms with link bolts.

The upper ball joint assembly is press fit into the upper control arm. The assembly attaches to the steering knuckle with a prevailing torque nut.

The lower ball joint assembly is riveted into the outer end of the lower control arm. A prevailing torque nut joins the steering knuckle to the lower ball joint.

The inner ends of the upper and the lower control arms have pressed-in bushings. The bolts pass through the bushings and join the arms to the frame.

Ball joint assemblies have rubber grease seals. These seals prevent the entry of moisture and dirt. This prevents damage to the bearing surfaces. All ball joints have grease fittings for routine maintenance.

Four-wheel drive 15/25 series pickup and all 15 series Tahoe/Yukon/Suburban/Yukon XL models have a front suspension that consists of the following components:

The upper part of each shock absorber extends through a frame bracket. Two insulators and a nut secure the upper part of the shock to the frame. A through bolt secures the lower part of the shock to the lower control arm.

A spring steel stabilizer shaft controls the side roll of the front suspension. This shaft is mounted in rubber insulators that are held by clamps to the frame side rails. The ends of the stabilizer shaft connect to the lower control arms with link bolts.

The upper and the lower ball joint assemblies are press fit into the upper and lower control arms. The assembly attaches to the steering knuckle with a prevailing torque nut

Torsion bars replace the conventional coil springs. The front end of the torsion bar attaches to the lower control arm. The rear of the torsion bar mounts into an adjustable arm at the torsion bar crossmember. This arm adjustment controls the vehicle trim height.

Both RWD and 4WD models have sealed front wheel bearings. These bearings are pre-adjusted and need no lubrication.