GM 90576508
Suspension Crossmember

First, raise and support the vehicle to have the face of rear axle support flange fastening bolts to be accessible, in order for replacement of the cross member used in the rear suspensions. Make sure to remove the tire and wheel and also remove the rear Wheel Speed Sensor connections. Next, remove the propeller shaft disc joint bolts 95 nm (70 ft. Lbs.) from rear diff, flange and take off exhaust system using rubber body mount. Take off the brake pipe clips as well as brake pipes on the lower control arms, then the parking brake cables off from the actuator brackets. Suspend the rear Brake Calipers, without fairing bleeding the brake hydrulic system, and scribe around the perimeter of the rear axle cradle mount for a reference mark, to ensure accurate reinstallation of the rear axle assemblies. Support the rear axle cradle and make sure it is properly supported for weight distribution, and support both lower control arms when removing the shock absorber lower mount bolt. You remove the shock absorber lower mounting bolts, then you remove the rear axle cradle mount bolts, and you pivot your rear axle cradle to remove the springs. Lift up the vehicle and, when not using a universal support table, set the rear axle cradle on the floor jack and stands before removing the rear axle support flange bolts and the rear axle support bushing bolts in order to remove the rear axle cradle. To install install the rear axle cradle supporting it only and placing it into position the rear axle cradle tightening in the process the rear axle support bushing bolts (125 Nm (92 ft. Lbs.) and rear axle support flange bolts (65 Nm (48 ft. Lbs.). Lift the vehicle, allow the springs to go, align the rear axle cradle to earlier scribed marks, and apply rear axle cradle mount bolts (65 Nm (48 ft. Lbs)). Support the lower Control Arm for bolt alignment and fasten the shock absorber lower mounting bolts (110 Nm (81 ft. Lbs.)). Unbolt the support from the rear axle cradle then install the rear Brake Calipers, parking brake cables and brake pipes to the lower control arms as well as fixing with clips. Place back the exhaust system at the rubber body mounts, reattach the prop shelter disc joint bolts (95 Nm (70 ft. Lbs.)) to the rear differential flange, reconnect the rear Wheel Speed Sensor associations, and place back the tire and colossus. Finally, bring down the vehicle and change the rear toe to standards.

In order to service the rear suspension, they must first raise and support the vehicle with a rear axle support flange fastening bolts being accessible. Separate from the tire and the wheel assemblies, along with the rear Wheel Speed Sensor connections. Next, pull the propeller shaft disc joint bolts on the rear differential flange loose and remove the exhaust system at the rubber body mounts. Remove the brake pipe clips, brake pipes from the lower control arms, as well as remove the parking brake cables from the actuator brackets. Take the rear Brake Calipers off without entering the brake hydraulic system and scribing reference mark around the dimension of the rear axle cradle mount to ensure correct reconconnections. Support the rear axle cradle so it is supported to meet weight distribution and lower Control Arm support each when removing the lower mount bolt of the shock absorber. After that, take off the shock absorber lower mounting bolts, followed by the rear axle cradle mount bolts, and finally pivot the rear axle cradle to take off the springs. Lower the vehicle, and if using anything other than a universal support table, apply a floor jack and stands to support the rear axle cradle before removing the rear axle support flange bolts, and rear axle support bushing bolts, to get the rear axle cradle out. For the installation, always support the rear axle cradle, place it in positions, and install it: tighten rear axle support bushing bolts to 125 nm (92 ft. Lbs.) and rear axle support flange bolts to 65 nm (48 ft. Lbs.). Raise the vehicle, install the springs, align the rear axle cradle to the earlier scribe marks and install the rear axle cradle mount bolts and tighten to 65 nm (48 ft. Lbs.). Support the lower Control Arm to align the bolts and install the shock absorber lower mounting bolts, tightened to 110 nm (81 ft. Lbs.). Prepare the rear axle cradle, filter out the support from rear axle cradle and fit rear brake. Caliper install parking brake cables and brake pipes to the lower control arms, with clips fitted. Replace j suggestion the exhaust system at the rubber body mounts, then the propeller shaft disc joint bolts into the differential flange, followed by a torque-to-95 nm (70 ft. Lbs.). Reconnect the rear Wheel Speed Sensor connects and install the tire and wheel parts, lower the vehicle, and adjust the rear toe to specifications.