1986-1997 Ford Aerostar Rear Lower Control Arm: Solving Clunks and Bushing Failure

Symptoms of a Failing Rear Lower Control Arm

Failure of the rear lower control arm is almost always due to the rubber bushings wearing out. When these bushings fail, they create excessive movement between the rear axle and the vehicle's frame, leading to several distinct symptoms.

• Clunking or Banging Noises: This is the most common sign. You may hear a single, sharp clunk or a series of bangs from the rear of the van, especially when going over bumps, accelerating from a stop, or shifting into reverse. This sound is the metal sleeve inside the worn bushing hitting against the control arm or the mounting bolts.
• Rear-End Instability: The vehicle may feel loose or like it's 'wandering' from the back, requiring constant steering corrections to keep it straight. In some cases, it can feel as if the rear of the van is trying to steer itself, particularly when accelerating out of a turn.
• Vibrations: Worn bushings are less effective at absorbing road imperfections, which can lead to increased vibrations felt in the seats and floor.
• Uneven Tire Wear: While less common than with front control arms, a severely worn rear bushing can affect axle alignment enough to cause premature or uneven wear on the rear tires.
• Visible Bushing Damage: A visual inspection can often confirm the problem. Look for cracked, torn, rotted, or completely missing pieces of rubber in the bushings at either end of the control arm.

Known Issues, Recalls, and TSBs

As of mid-2026, there are no specific recalls or Technical Service Bulletins (TSBs) issued by the NHTSA or Ford that directly address the rear lower control arms or their bushings on the 1986-1997 Ford Aerostar. The primary issue with this part is simply age-related wear and tear of the rubber bushings, which is a common maintenance item on high-mileage or older vehicles.

Buying a Used vs. Rebuilding Your Original Arm

For this specific part, new complete aftermarket control arms are generally not available from major retailers as of 2026. New Old Stock (NOS) OEM arms are also exceptionally rare and likely unavailable. This leaves you with two primary options: buying a quality used OEM control arm or rebuilding your existing arm with new bushings.

Option 1: Buying a Used OEM Lower Control Arm (Recommended)

For most DIY mechanics and many professional shops, sourcing a good-condition used OEM arm is the most practical and efficient solution. It arrives as a complete assembly, ready to be bolted in.

What to Inspect on a Used Part:

• Bushings are Key: The condition of the bushings is the most important factor. Inspect the rubber closely. It should be pliable, intact, and free of deep cracks, rot, or missing sections. If the bushings look as bad as your old ones, pass on the part.
• Check for Straightness: Look down the length of the arm to ensure it is not bent or twisted. A bent arm will make alignment impossible and is a sign the donor vehicle was in a significant collision.
• Assess Rust: Surface rust is normal for a part of this age and is purely cosmetic. However, you must reject any arm with deep, flaking, or scaly rust that compromises the structural integrity of the steel.
• Verify Compatibility: The rear lower control arms are identical for the left and right sides and fit all 1986-1997 Ford Aerostar models.

Option 2: Rebuilding with New Bushings

If you cannot find a good used arm or prefer to have new wear components, you can purchase new bushings and press them into your original control arms. Bushings are readily available from brands like Moog, AC Delco, and Mevotech.

Considerations for Rebuilding:

• Special Tools Required: You will need a hydraulic shop press with appropriate mandrels (adapters) to safely press the old bushings out and the new ones in. Attempting this with a hammer or vise is not recommended and can damage the arm or the new bushings.
• Risk of Damage: The control arm must be properly supported in the press. Failure to do so can easily bend or distort the stamped steel arm, rendering it useless.
• Increased Labor: This method adds significant labor time compared to simply swapping the complete arm. You must first remove the arm, then perform the pressing work, and finally reinstall it.

Cost Comparison

Prices can vary based on your location and the supplier. The following is an estimated breakdown to help you compare options.

Replacement Overview & Torque Specs

Replacing the rear lower control arm is a feasible DIY project for someone with experience in suspension work. It requires proper safety precautions, including using jack stands on a level surface.

General Steps:

1. Safely raise and support the rear of the vehicle and remove the wheel.
2. Place a floor jack under the rear axle near the control arm for support.
3. Remove the bolts securing the control arm to the frame and to the axle bracket.

4. Pro Tip: On the driver's side, the forward control arm bolt may be difficult to remove without hitting the gas tank. You may need to loosen the gas tank straps slightly to gain the necessary clearance.

5. Remove the old control arm.
6. Install the new or rebuilt control arm. Hand-tighten the bolts.

7. Important: Do not fully tighten the pivot bolts until the vehicle's full weight is resting on the suspension. Tightening them with the axle hanging can preload and quickly destroy the new rubber bushings. Lower the vehicle onto ramps or place the jack stands under the axle to load the suspension before final tightening.

8. Once the suspension is loaded, torque the bolts to specification.
9. Reinstall the wheel and have a professional wheel alignment performed.

Torque Specifications

Frequently Asked Questions (FAQ)