GM 89027244
Suspension Crossmember

Before changing the Rear Crossmember, raise and support the vehicle. See the nut and bolt and take them away in order to get the lh rear suspension Trailing Arm separated from the rear suspension knuckle, do the same to the right hand rear suspension Trailing Arm. Now, take out 2 nuts and 3 washers to pull of the lh rear suspension rear lower Control Arm , and do as much for the rh rear suspension rear lower Control Arm. And support the rear suspension crossmember by a jack meanwhile remove the 2 bolts that hold the rear suspension support brace to the body likewise the 4 bolts that hold the rear suspension cross member to the body and the latter go down. If changing rear suspension crossmember, remove 2 bolts on it, remove the rear suspension support brace from it, remove 2 inner bolts on it, 4 washers, the lh rear suspension front lower Control Arm, the rh rear suspension front lower Control Arm. Installation will require the rear suspension support to be installed at the rear suspension crossmember through the use of 2 bolt and is tightened to 19 nm (14 ft. Lbs) not gym lower Control Arm nuts until the rear lower Control Arm to the vehicle is capable. Install the lh and rh rear suspension front lower control arms, 4 washers and 2 inner bolts without bolting. Raise the rear suspension cross member and bolt it to the body with 6 bolts. The 4 outer bolts should be tightened to 74nm(55ftlbs) while the 2 inner bolts should be tightened to 19nm (14ftlbs). Then remove the jack, then place the lh rear suspension rear lower Control Arm with 3 washers and 2 nuts but not tightening and the same for the rh rear suspension rear lower Control Arm. Mount the lh rear suspension Trailing Arm to the rear suspension knuckle and bolt it up without tightening then do the same for the rh rear suspension Trailing Arm. Lower the vehicle and transfer it to a drive-on lift or alignment rack. Stabilize the suspension by bouncing the vehicle to let it settle, then tighten 2 nut and bolts back of suspension Trailing Arm to knuckle and the 4 rear suspension control am to nuts and bolts by 91 nm (67 ft. Lbs.) and 125 nm (89 ft. Lbs.) respectively. Measure the rear wheel alignment and correct if required prior to taking the vehicle off of the alignment rack.

In order to service and repair the rear suspension cross-member, it is important to raise, and support the vehicle. To remove the lh rear suspension Trailing Arm, you need to remove the nut and bolt to disconnect the rear suspension knuckle to the rear suspension Trailing Arm, while at the same time separating the rear suspension Trailing Arm on the rh to separate it also. Next, take off the 2 nuts, 3 washers, and lh rear suspension rear lower Control Arm, and then the same of the rh rear suspension rear lower Control Arm. Support the rear suspension crossmember using a jack, then remove the 2 bolts holding the rear suspension support brace to body and the 4 bolts holding the rear suspension crossmember to the body before lifting the crossmember. In case of a replacement of the rear suspension crossmembers, take off the two bolts and the rear suspension support bracket from the crossbar. Remove the two inner bolts, four washers, lh rear suspension front lower Control Arm, and rh rear suspension front lower Control Arm, from the rear suspension crossmember. For installation, attach the rear suspension support brace to the rear suspension cross member using 2 bolts secured to 19 nm (14 ft. Lbs) and do not install the lower Control Arm until the rear lower Control Arm is installed. Mount the lh and rh rear suspension front lower control arms, 4 washers and 2 inner bolts without tightening. Jack up the rear suspension crossmember and secure with 6 bolts, tightening the 4 outer bolts to 74 nm (55 ft. Lbs.) and the 2 inner to 19 nm (14 ft. Lbs.). Take out the jack and then install the lh rear suspension rear lower Control Arm, and install 3 washers plus 2 nuts loosely; then install the rh rear suspension rear lower Control Arm and the same components. Mount the lh rear suspension Trailing Arm to the rear suspension knuckle and do not tighten the bolt and do the same on the rh rear suspension Trailing Arm. Wheels off, lower and three, and drive a lift rack. Lift suspension by bouncing the vehicle and allow to settle and tighten the 2 rear suspension Trailing Arm to knuckle nuts and bolts to 91 nm (67 ft. Lbs.) and 4 rear suspension Control Arm nuts and bolts to 125 nm (89 ft. Lbs.). Check the rear wheel alignment and correct it if required prior to taking the car off the alignment rack.

Tighten the 2 rear suspension trailing arm to knuckle nuts and bolts to 91 Nm (67 ft. lbs.) and the 4 rear suspension control arm nuts and bolts to 125 Nm (89 ft. lbs.).