Lemforder 1320302 Suspension Control Arm

Lemforder 1320302 Suspension Control Arm

The Lemforder 1320302 is a high‑performance suspension control arm designed for the rear axle of BMW and ALPINA vehicles, particularly the E39 series. It replaces the original OEM part with superior strength, precision engineering, and long‑term durability.

Key Features & Technical Highlights

• Material: High‑strength alloy steel forged to meet or exceed OEM specifications.
• Design: Triangular wishbone geometry that maintains optimal wheel alignment under load.
• Weight Reduction: Approximately 15–20% lighter than the stock arm, improving handling and fuel efficiency.
• Surface Finish: Powder‑coated or anodized finish to resist corrosion and extend service life.
• Compatibility: Fits right‑hand rear upper control arms for BMW 5 Series (E39), ALPINA B10, B20, D10 models, and many other variants with the same bolt pattern.
• Installation: Direct replacement – no modifications to suspension geometry or mounting points required.

Engineering Excellence

The 1320302 incorporates a meticulously engineered wishbone shape that distributes forces evenly across the joint. The arm’s curvature is optimized for the specific camber and caster angles of the E39 rear suspension, ensuring consistent tire contact with the road surface during cornering, braking, and acceleration.

Its forged construction provides a high fatigue life, resisting the repetitive stresses that can cause cracks or deformation in conventional stamped steel arms. The part also features a precision-machined mounting interface, guaranteeing accurate alignment with the steering knuckle and rear axle housing.

Performance Benefits

• Improved Handling: Reduced arm weight lowers unsprung mass, allowing the suspension to react more quickly to road irregularities.
• Enhanced Stability: The robust design maintains wheel alignment under heavy loads, reducing tire wear and improving braking performance.
• Long-Term Reliability: Corrosion-resistant finish and high-strength material ensure the arm remains functional for many thousands of miles without failure.

Installation Guide

1. Secure the vehicle on a lift or jack stands, ensuring it is level and stable.
2. Remove the rear wheel and disconnect the brake caliper to access the suspension components.
3. Loosen the bolts that attach the existing control arm to the steering knuckle and axle housing. Use a torque wrench set to the manufacturer’s specification (typically 80–100 Nm).
4. Detach the old arm, noting the orientation of any bushings or mounting plates.
5. Position the new Lemforder 1320302 in place, aligning it with the existing bolt holes. Ensure that the arm’s curvature matches the vehicle’s geometry.
6. Tighten all bolts to the specified torque sequence. Reinstall any bushings or mounting plates that were removed.
7. Reattach the brake caliper and wheel. Lower the vehicle and perform a test drive to confirm proper operation.

Maintenance Tips

• Inspect the control arm for signs of wear or damage after every major service interval.
• Check bolt torque regularly, especially if the vehicle is used on rough terrain or in high‑performance driving conditions.
• Avoid over-tightening bolts, which can strip threads or deform the arm.

Why Choose Lemforder?

Lemforder is renowned for producing aftermarket suspension components that match or surpass OEM quality. Their parts are engineered with precision machining, rigorous testing, and a commitment to durability. The 1320302 Suspension Control Arm exemplifies this philosophy, offering drivers a reliable upgrade that enhances both performance and longevity.

Conclusion

The Lemforder 1320302 is more than just a replacement part; it’s an investment in the vehicle’s handling dynamics and structural integrity. Whether you’re restoring a classic BMW E39, upgrading an ALPINA model, or simply seeking a dependable component for everyday driving, this suspension control arm delivers exceptional quality, performance, and peace of mind.