GM 25905442
Upper Control Arm

To change the upper Control Arm, first lift and support your vehicle. To remove the tire and wheel; remove the retaining bolt for the brake hose and the wheel speed sensor brackets. Next, undo the nut at upper Ball Joint and get rid of it. With the use of the Ball Joint separator (J-42188-B), disconnect the upper Control Arm from the Steering Knuckle. For 15-series 2wd/4wd and 25/35 series 2wd: take off the upper Control Arm nuts as well as adjustment cams and the upper Control Arm nuts, followed by upper Control Arm bolts and then remove the upper Control Arm. For the 25/35 series 4wd, use the same procedure to remove the upper Control Arm as well. Firstly, place the new upper Control Arm and install the upper Control Arm bolts for the 25/35 series 4wd. Put on the upper Control Arm nuts and adjustment cams and tighten the nuts to 190 nm 140 ft lbs. Repeat the program for installing on the 25/35 series 4wd, having ensured the upper Control Arm is bolted to the steering knuck. Replace a new nut on the top of the Ball Joint stud and tighten up to 50 nm (37 ft.lbs.). Replace the retaining bolts used for brake hose and wheel speed sensor brackets, tightening them to 9 nm (80-inch lbs.). Lastly, place the tire and wheel back on, remove the safety stands, the vehicle down, and check the alignment of the wheels.

Reinstall the torsion bars, the shock absorber lower nut and bolt, and the stabilizer shaft links to the lower control arm.

Begin by raising and supporting the vehicle, then remove the tire and wheel.

Raise and support the vehicle, then remove the tire and wheel.

Remove the front stabilizer shaft link and the shock absorber.

Tighten the nuts to 190 Nm (140 lb ft).

Position the new lower control arm and secure it with the control arm bolts and washers, ensuring to tighten the retaining nuts to 175 N.m (129 lb ft).

Tighten the retaining bolts to 120 Nm (89 ft. lbs.).

The torsion bars, followed by the shock absorber lower nut and bolt, and then the stabilizer shaft links to the lower control arm.

Remove the support for the steering knuckle and upper control arm, reinstall the wheel drive shaft if equipped, followed by the stabilizer shaft link to the lower control arm. Finally, put the tire and wheel back on, remove the support, lower the vehicle, and align the front end.

Begin by removing the tire and wheel, then lower the vehicle and support the lower control arm.

Remove the support for the steering knuckle and upper control arm, then reinstall the wheel drive shaft if applicable.

Remove and discard the lower ball joint retaining nut.

Take off the lower ball joint retaining nut and use the J 43631 Ball Joint Remover and J 45851 Ball Joint Separator Protector Adapters.

Install the lower control arm retaining nut and tighten the retaining bolts to 120 Nm (89 ft. lbs.).

Use mechanics wire or an equivalent to support the knuckle and upper control arm.