See Figures 1 and 2
A four link rear suspension is used on the large-body Buick, Oldsmobile and Pontiac models, except 1975-76 station wagons. The axle housing is connected to the frame by two upper and lower control arms with rubber bushings at each end of the arm. The control arms oppose torque reaction on acceleration and braking, and maintain the axle relationship to the frame.
Two coil springs support the weight of the vehicle in the rear. They are retained between seats in the frame and brackets welded to the axle housing. A rubber insulator is used on the upper side. Shock absorbers are mounted on brackets between the axle housing and the frame.
The rear suspension on 1975 and 1976 station wagons is by parallel leaf springs and shock absorbers.
A sway bar is optional equipment on coil spring models.