GM 15182555
Coil Spring, Rear

First prepare to replace the rear coil spring by supporting the vehicle with stands while also suspending the rear axle. If your vehicle contains a real time damping (RTD) sensor you should disconnect it before continuing. The installation starts by removing the stabilizer shaft link retaining nut from the stabilizer shaft and next taking out the lower shock absorber retaining nut and bolt from the rear axle assembly. Lower the rear axle so springs lose their tension before removing the coil spring together with the upper insulator. Take the following steps to install: position the coil spring and upper insulator followed by axle lift. Tighten the rear axle lower shock absorber retaining nut and bolt to a torque of 95 nm (70 ft. Lbs.). Secure the stabilizer shaft link to its shaft while making sure the inner jam nut reaches maximum contact on its ball stud after applying torque to the lower link nut. The stabilizer shaft link retaining nut requires tightening to 65 nm (48 ft. Lbs.). Lower the vehicle before removing the rear axle support and reconnecting any rtd sensor.

Use the outboard locating tab (15 Series) and the inboard locating tab (25 Series).

The lower shock absorber nuts.

Reconnect the ESC sensor if equipped, remove the rear axle support, and finally lower the vehicle.

For vehicles with electronic suspension, tighten to 80 Nm (59 lb ft) and the electrical connector to 20 Nm (15 lb ft); for vehicles without electronic suspension, tighten the shock absorber nut to 60 Nm (44 lb ft).