GM Century/Lumina/Grand Prix/Intrigue 1997-2000

FRONT SUSPENSION

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Fig.



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Fig. Typical W-Body front suspension arrangement

The front suspension is a conventional front-wheel drive strut design. The front spring is mounted between a lower strut spring seat and an upper strut mount spring seat. The spring is cushioned between rubber insulators. The upper and lower coils are tapered to a small diameter.

The front steering knuckle is a machined aluminum casting. Do not use a hammer to loosen suspension components from the knuckle. Suspension components attached to the knuckle (front lower control arm ball stud, ABS sensor bracket and strut damper) are made of steel and have special coatings to prevent corrosion.

The upper steering pivot point (strut bearing) has been placed in the upper spring seat. The bearing is pressed into the front hub and is permanently lubricated and requires no service. The upper spring seat is plastic and is offset at an angle to minimize side loads on the strut and upper strut mount bushing. The dust shield is designed to protect the strut from dirt and corrosion. The shield also contains a strut jounce bumper.

The lower control arm is a two-piece steel welded unit with a riveted ball joint. A conventional rubber bushing is used for the rear lower control arm pivot. The front lower control arm bushing is mounted vertically.

GM W-Body vehicles use non-serviceable wheel hubs and bearings at both the front and rear wheels. The bearing cannot be greased. If a hub bearing is determined to be defective, unit replacement is required.

A stabilizer shaft is mounted to the top rear of the frame and to the lower control arm. The shaft is attached to the frame with clamps and rubber insulators and to the control arm with insulator links.

Suspension components that are bent, worn, or damaged must be replaced with new parts. Do not attempt to heat, quench or straighten parts. Bent or damaged suspension parts are often an indication that the vehicle has been in an accident or driven in an abusive manner. When bent or damaged suspension parts are discovered, a thorough inspection of the knuckle, along with the ball joint and steering tie rod ball attachments should be performed. In addition, fastener torque should be checked at the control arm to frame, strut to knuckle and front lower control arm ball stud to frame.

During component service, if any of the items listed below require replacement, it is not necessary to check or adjust camber and toe.



Strut bumper
 
Strut shield
 
Upper spring seat
 
Strut bearing
 
Spring insulators
 

If any of the items listed below require replacement during service, GM specifies that a vehicle wheel alignment (check/adjust camber and toe) is required.



Strut damper
 
Knuckle
 
Control arm
 
Strut mount
 
Spring
 

 
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