GM Caprice 1990-1993 Repair Guide

FRONT SUSPENSION

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See Figures 1 and 2



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Fig. Fig. 1: Front suspension



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Fig. Fig. 2: View of front suspension with vehicle safely supported

The front suspension is designed to allow each wheel to compensate for changes in the road surface level without appreciably affecting the opposite wheel. Each wheel is independently connected to the frame by a steering knuckle, upper and lower ball joint, and upper and lower control arm. The steering knuckles move in a prescribed three dimensional arc. The front wheels are held in proper relationship to each other by steering linkage, which includes the inner and outer tie rods, center link, idler arm and pitman arm.

Coil chassis springs are mounted between the spring housings on the frame and the lower control arms. Ride control is provided by double, direct acting shock assemblies. The upper portion of each shock assembly extends through the center of the coil spring and attached to the top of the frame housing with a nut. The lower portion of the shock is connected to the lower control arm.

Side roll of the front suspension is controlled by a spring steel stabilizer shaft. It is mounted in rubber bushings which are held to the frame side rails by brackets. The ends of the stabilizer are connected to the lower control arms by link bolts isolated by rubber grommets.

The upper control arm is attached to a cross shaft through isolating rubber bushings. The cross shaft is in turn bolted to the frame brackets. Shims are generally installed between the frame brackets and cross shaft to aid front end alignment, thus controlling the caster and camber adjustment. A ball joint is riveted to the outer end of the upper control arm. The upper ball joint is attached to the steering knuckle by a castellated nut and cotter pin.

The inner ends of the lower control arm have pressed-in bushings. Bolts, passing through the bushings, attach the arm to the suspension crossmember. The lower ball joint assembly is a press fit in the arm and attaches to the steering knuckle with a castellated nut and cotter pin.

Rubber grease seals are provided at all of ball socket assemblies to keep dirt and moisture from entering the joint and damaging bearing surfaces.

 
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