Toyota 48610-04020 Arm Assembly

Disconnect the cable from the negative terminal of the battery. Loosen the wheel lug nuts, raise the front of the vehicle, and support it securely on jackstands while applying the parking brake. Remove the wheel. Disconnect the ABS wheel speed sensor and separate the wiring harness bracket from the upper control arm and steering knuckle. For 4WD and PreRunner models, remove the wiring harness bracket for clearance to remove the upper arm pivot bolt. For 2WD models, detach the brake hose from the shock absorber. Support the lower control arm with a floor jack. Remove the cotter pin, then loosen the upper balljoint nut about 1/4 inch. Use a two-jaw puller or a balljoint separator to separate the balljoint from the steering knuckle, ensuring the steering knuckle does not fall outward to avoid damaging the brake hose. Remove the fasteners and detach the upper control arm from the frame, then remove the arm, noting that 4WD and PreRunner models use one long pivot bolt while 2WD models use two shorter pivot bolts. Inspect the bushings for wear and deterioration; if damaged, take the arm to an automotive machine shop for new bushings. Installation is the reverse of removal, ensuring to tighten the wiring harness bracket fasteners securely and all suspension fasteners to the specified torque values. Use a new cotter pin and castle nut on the upper control arm balljoint, tightening the castle nut as needed to align the hole in the ballstud with the slots in the nut without loosening it. Tighten the pivot bolt(s) with the vehicle at normal ride height, which can be simulated by raising the lower control arm with a floor jack. Finally, tighten the lug nuts to the specified torque and consider having the wheel alignment checked and adjusted if necessary.