GM 15820927 Rear Suspension Trailing Arm Assembly

For the removal of Trailing Arm 1, first release the rear wheel lug nuts and secure the front wheels. Next, lift the back of your vehicle and set it up on sturdy jackstands. Remove the rear wheels as well as the back part of the exhaust system. Lastly, unhook from stabilizer bar link at stabilizer bar and if there is any disconnect ABS wiring harness clips from arm. On trailing arms' rear knuckle remove mounting fasteners for both trailing arms and detach both arms from knuckle. Take off hydraulic brake line from above of rear suspension support and place a floor jack under it. Raise this until only touch its center with that support just a bit higher to make sure it does not slip out when a bolt is removed in step seventeen below. Unbolt rear suspension support on same side that arm is being removed from and loosen bolts on opposite side of support. Lower slowly with floor jack until trailing arm's mounting fasteners can be reached by you in case if required put one big bolt through last hole so that after flooring we will use that bolt to pull beam down safe .A pipe clamp put around top so we could tighten them all together so that they won't move apart anymore but check also what kind of other connections may exist between parts here.Put a stack or 2x4s on ground next to where jack will stand take stand out place directly under blue lifting device . Now go ahead remove remaining nuts completely before taking even larger ones loose then look carefully inspect bushings both sides neatness because if necessary replace these things (two small metal inserts into rubber) otherwise don't take anything off yet or else would be forced having them repaired pretty soon anyway. For Trailing Arm 2 follow exactly the same steps like those followed for Trailing Arm 1.To remove Trailing Arm, take out bracket-to-body mounting bolts and trailing arm-to-knuckle mounting fasteners of trailing arm. Finally, remove the trailing arm and check the condition of its bushing. Take it for bushing replacement if necessary.

Loosen the wheel lug nuts, raise the rear of the vehicle, and support it securely on jackstands while blocking the front wheels to prevent rolling. Remove the wheels and the stabilizer bar. Take off the brake drums or calipers and discs from the hubs, unplugging the ABS electrical connectors if equipped. For trailing arms, remove the trailing arm-to-knuckle nut and bolt, followed by the trailing arm-to-chassis nut and bolt using two wrenches, then detach the trailing arm and lower it from the vehicle. Installation is the reverse of removal, ensuring not to tighten the nuts and bolts until the vehicle weight is lowered onto the suspension. For 1996 and earlier models, compress and detach the auxiliary spring if equipped, then remove the nuts and bolts connecting the rods to the knuckle and the rod inner bolts at the crossmember. Mark the position of the toe adjusting cam for 1988 and 1989 models before removing it, pushing the bolt through to allow rod removal, and note that some models may require lowering the fuel tank for access. Installation follows the reverse order, applying thread locking compound to all bolts and checking the rear toe after installation. For 1997 and later models, lower the rear suspension cross member using a transmission jack for access to the inner arm bolts/nuts, remove the bolts securing the cross member to the body, and then lower the jack to remove the lateral rod inner bolts/nuts. Remove the nuts and bolts connecting the rods to the knuckle, and during installation, do not tighten the outer lateral rod bolts until the vehicle weight is lowered onto the suspension. For the knuckle, mark the strut-to-knuckle relationship, remove the rear brake drum or caliper and disc, and detach the trailing arm, lateral link rods, and any auxiliary damper or stabilizer bar from the knuckle. Remove the strut-to-knuckle nuts and knock the bolts out, then separate the knuckle from the strut and lower it from the vehicle. To install the knuckle, slide it into the strut flange, install the stabilizer bar bracket and auxiliary damper if equipped, apply thread locking compound to the threads, and install the nuts finger tight. Connect the lateral link rods and trailing arm to the knuckle, align the previously made marks, and tighten the strut-to-knuckle bolts to the specified torque, completing the installation in reverse order.

Installation is the reverse of removal, with all fasteners tightened to torque specifications. A front wheel alignment check and adjustment are recommended.

After that, remove the fasteners that attach the control arm to the subframe and separate the control arm from the subframe.

For inspection, check the control arm for distortion and the bushings for wear, replacing any worn or damaged parts. Do not attempt to straighten a bent control arm. If the bushings are cracked or show signs of wear, take the control arm to have the bushings replaced.

To remove Suspension Arm 1, you need to detach the rear portion of the exhaust system, disconnect the stabilizer bar link, remove the ABS wiring harness clips, and detach the hydraulic brake line.

The first step is to remove the front coil spring.

Fit the wheel and lower the vehicle to the floor, then torque-tighten the shaft retainer bolts or nuts.

Insert the balljoint stud into the control arm, install the castellated nut, and tighten it to the specified torque, adjusting if necessary to align the cotter pin hole, then install a new cotter pin.

To remove Suspension Arm 1, you need to detach the rear portion of the exhaust system, disconnect the stabilizer bar link, remove the ABS wiring harness clips, and detach the hydraulic brake line. Then, place a floor jack beneath the rear suspension support, raise it slightly, and remove the mounting bolts for the rear suspension support. Lower the support to gain access to the suspension arm's mounting fasteners, and finally, remove the arm and inspect the bushings for deterioration.