Overview of Control Arm Bushing Replacement on a Lexus RX

Control arm bushings are critical components of your Lexus RX’s suspension system. They connect the control arm to the vehicle frame and the wheel hub, absorbing road vibrations and maintaining proper wheel alignment. Over time, these rubber or polyurethane bushings wear out, leading to symptoms such as clunking noises over bumps, vague steering, uneven tire wear, and reduced ride comfort. Replacing worn control arm bushings can restore the vehicle’s handling, reduce NVH (noise, vibration, harshness), and prolong the life of your suspension. This guide provides a detailed, step-by-step approach to replacing the control arm bushings on a Lexus RX, covering the tools, techniques, and safety measures required for a successful job. While the process is similar across many RX model years (2000–2022), always consult your specific vehicle’s service manual for torque specifications and variations.

Tools and Materials Needed

Having the right tools on hand ensures efficient and safe bushing replacement. Below is an expanded list of what you’ll need:

  • Jack and jack stands (two stands minimum; four recommended for stability)
  • Floor jack with lifting capacity of at least 2 tons
  • Wheel chocks
  • Socket set (metric, including 10mm, 12mm, 14mm, 17mm, 19mm, 22mm)
  • Combination wrenches and ratcheting wrenches
  • Torque wrench (capable of measuring up to 150 ft-lb)
  • Bushing press or ball joint press kit (rentable at auto parts stores)
  • Large C-clamp or hydraulic press (alternative to bushing press)
  • Replacement control arm bushings (OEM or aftermarket polyurethane
  • Penetrating oil (like PB Blaster or Kroil)
  • Lubricant (silicone or rubber-safe grease for installation)
  • Rubber mallet
  • Brass drift punch or socket set (for driving bushings)
  • Safety glasses and gloves
  • Shop rags and brake cleaner (for cleaning surfaces)
  • Jack stands (two stands minimum; four recommended for stability)
  • Ball joint separator (if the control arm requires tie rod or ball joint disassembly)

Many auto parts stores offer free loaner tools like bushing press kits. Use caution with rented tools to avoid damaging the control arm.

Safety Preparations

Working under a vehicle carries inherent risks. Follow these safety steps before beginning:

  • Park the Lexus RX on a level, solid surface. Engage the parking brake and place wheel chocks behind the rear wheels (if working on the front) or front wheels (if working on the rear).
  • Loosen the lug nuts on the wheel you are removing while the vehicle is still on the ground. Do not remove them completely yet.
  • Use a floor jack to lift the vehicle at the designated jacking point (check owner’s manual). Place jack stands under the frame or subframe, not under the control arm. Lower the vehicle onto the stands and double-check stability.
  • Never rely solely on a hydraulic jack. Always use jack stands rated for the vehicle weight.
  • Wear safety glasses to protect from debris, and gloves to protect from sharp edges and chemicals.
  • Allow the vehicle to cool if it has been driven recently, as exhaust components and brakes can be hot.

Step-by-Step Replacement Procedure

1. Remove the Wheel and Access the Control Arm

After securing the vehicle on jack stands, completely remove the loosened lug nuts and take off the wheel. Set the wheel aside. You now have clear access to the control arm (also called the lower arm in many Lexus RX configurations). The control arm bushings are located at the inner end (frame side) and sometimes at the outer end (ball joint connection). Most Lexus RX models have two bushings per control arm: a large forward bushing and a smaller rearward bushing. Some versions use a single bushing with a hydro-mount. Identify the bushings that need replacement; typically, both are replaced simultaneously.

2. Loosen Rusted Bolts with Penetrating Oil

Spray penetrating oil on all control arm mounting bolts, especially the through-bolts that hold the bushings. Allow the oil to soak for at least 10 minutes. For heavily rusted bolts, apply again and wait longer. This step prevents bolt stripping and makes removal easier.

3. Remove the Control Arm Bolts

Using the appropriate socket and ratchet, remove the bolts securing the control arm to the subframe. On most Lexus RX models, there are two large bolts: one at the front bushing and one at the rear. Some models also have a separate bolt attaching the control arm to the wheel hub. If the ball joint stud needs to be separated, use a ball joint separator tool. Do not hammer on the ball joint threads. Carefully detach the control arm from the vehicle. If the control arm is stuck, use a rubber mallet to tap it loose. Set the control arm on a workbench.

4. Remove Old Bushings from the Control Arm

This is the most critical part. You have several methods:

  • Bushing press kit: Use a C-press or ball joint press with appropriately sized cups and adaptors. Position the press so the outer race of the bushing is supported, then push the old bushing out. Follow the press kit instructions carefully.
  • Hydraulic press: Place the control arm on a press with a receiving cup underneath. Press the old bushing out from the outer side.
  • Rubber mallet and socket method: If you do not have a press, you can carefully drive the bushing out using a rubber mallet and a large socket or drift punch. This requires patience and a steady hand to avoid distorting the control arm. Work from the outer side of the bushing. For stubborn bushings, apply heat cautiously (use a propane torch) to soften the rubber, but be aware of fire risks and avoid damaging surrounding parts.
  • Cutting the bushing: Some technicians cut the rubber with a saw or drill a series of holes to collapse the metal shell, then press it out. This is a last resort for seized bushings.

Inspect the control arm for cracks or damage after bushing removal. If the control arm is bent or corroded, replace the entire arm instead of just the bushings.

5. Prepare the Control Arm for New Bushings

Clean the bushing bores thoroughly with brake cleaner and a wire brush. Remove any rust or debris. Apply a thin coat of anti-seize compound or rubber-friendly lubricant to the outer surface of the new bushing and the inner bore. This aids installation and prevents corrosion. If using polyurethane bushings, they often require a specific grease; consult the manufacturer.

6. Install New Bushings

Align the new bushing squarely with the bore. Use the press or C-clamp to push it in evenly. Ensure the bushing is fully seated; there should be no gap between the bushing flange and the control arm. If the bushing has an alignment mark or offset, install it in the correct orientation per the service manual. Some bushings require a certain rotational position. Tighten the press until the bushing is flush, then release. Avoid over-pressing, which can damage the bushing.

For polyurethane bushings, they may be slightly oversized; using a bushing installation tool or a press is recommended. Do not hammer directly on the bushing shell as it may deform.

7. Reattach the Control Arm to the Vehicle

Place the control arm into position on the subframe. Insert the mounting bolts but do not fully tighten them yet. Reconnect the ball joint or tie rod end if it was separated. Tighten the ball joint nut to the manufacturer’s torque specification (typically around 27–35 ft-lb for the lower ball joint nut on Lexus RX models, plus a pin if used).

For the control arm pivot bolts, it is essential to tighten them to the correct torque only after the vehicle’s weight is on the wheels. This is because the bushings are designed to be in a neutral position at ride height. If you tighten them while the suspension is hanging, the bushings will be twisted when the car is lowered, causing premature failure and poor ride quality. Therefore, perform the following step before final torque.

8. Lower the Vehicle and Torque Bolts at Ride Height

Remove the jack stands and lower the vehicle carefully so that the full weight is resting on the wheels. On a level surface, tighten the control arm pivot bolts to the specified torque. For a typical Lexus RX (e.g., 2004 RX330), the rear bushing bolt torque is about 85 ft-lb, and the front bushing bolt torque is around 90 ft-lb. Always verify with your model’s service manual. Use a torque wrench for accuracy.

After tightening, replace the wheel and hand-tighten the lug nuts. Lower the vehicle completely, then torque the lug nuts to the factory specification (often 76 ft-lb for Lexus RX models) in a star pattern.

Additional Considerations

Bushing Material: OEM Rubber vs Polyurethane

Original equipment bushings are made of rubber, which offers good vibration damping but wears out faster. Aftermarket polyurethane bushings provide improved durability and sharper handling, but they transmit more road noise and vibration. For daily driving, OEM-style rubber is recommended. For performance-oriented use or if you plan to keep the vehicle long-term, polyurethane can be a good upgrade. Ensure the bushings are specifically designed for your Lexus RX model year.

Alignment After Bushing Replacement

Replacing control arm bushings can alter the wheel alignment, especially caster and camber. It is highly recommended to have a professional wheel alignment performed after the job. Even if you do not notice a pull, an alignment ensures even tire wear and proper handling. Some Lexus RX models have adjustable camber on the front, while others require aftermarket camber bolts for adjustment. Discuss this with the alignment technician.

Torque Specifications

Always refer to a reputable source for torque specs. For common Lexus RX models (2000–2015): front lower control arm rear bushing bolt: 83–89 ft-lb; front bushing through-bolt: 85–90 ft-lb; lower ball joint stud nut: 36–42 ft-lb. These values are approximations; exact specs vary by year. Rely on your service manual or a trusted online database.

Troubleshooting Common Issues

  • Stubborn bolts: Apply penetrating oil repeatedly. Use a breaker bar for extra leverage. If a bolt strips, replace it with an OEM bolt from the dealer.
  • Bushing will not press in: Lubricate the bore and bushing. Ensure press adaptors are sized properly. Check for burrs on the control arm; file them smooth. Poly bushings may need to be chilled slightly in a freezer for 30 minutes to shrink them temporarily.
  • Noise after installation: Verify that all bolts are torqued correctly and that the bushings are not twisted. Check that the control arm did not contact any nearby components. If polyurethane, ensure proper lubrication was used.
  • Uneven ride height: May indicate control arm damage or incorrect bushing orientation. Recheck installation.

Conclusion

Replacing control arm bushings on a Lexus RX is a moderately challenging DIY task that can be accomplished with basic mechanical skills and the right tools. Following this step-by-step guide will help you restore your vehicle’s suspension performance and ride comfort. Take your time, prioritize safety, and don’t skip the final alignment. For more detailed information, consult the Lexus Owner’s Service Manual for your specific model. Additionally, resources like Club Lexus Forums provide real-world advice from fellow owners. Quality replacement bushings can be sourced from RockAuto or your local dealer. With patience and care, your Lexus RX will ride and handle like new.