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Oldsmobile Control Arm Parts Questions & Experts Answers
Q: How to replace the upper control arm and ensure proper installation on Oldsmobile Cutlass?
A: Raise the front end of the vehicle and lower the control arm onto a jack for support, then remove the wheel. Separate the upper control arm ball stud and remove the two nuts securing the control arm shaft to the frame bracket, ensuring to tape together the shims for reinstallation in the same position. In some cases, it may be necessary to remove the upper control arm attaching bolts for clearance; gently tap the bolt downwards with a brass drift, pry it upwards with a suitable box wrench, and then use a pry bar and block of wood to remove the bolts from the frame. After removing the upper control arm, inspect the control arm pivot bushings; if they are worn, replacement is best handled by a GM dealer, but if you proceed, use a long bolt and suitable tubular spacers for removal and installation. When installing, loosen the end shaft retainer bolts or nuts, position the new control arm attaching bolts loosely in the frame, and install the control arm cross-shaft on the attaching bolts. Use a normal free-running nut to tighten the serrated bolts onto their seats, then remove the free-running nuts and fit the regular locknuts once the splined bolts are seated. Install the shims in their original positions and torque-tighten the nuts, starting with the thinner shim pack nut for improved clamping force and torque retention. Install the ball stud through the knuckle, torque-tighten the nut, further tighten to align the cotter pin holes, and fit a new cotter pin. Finally, fit the wheel and lower the vehicle to the floor, then torque-tighten the shaft retainer bolts or nuts.