URO 31121139999 Suspension Control Arm - Front Left Upper

Overview of URO Front Left Upper Suspension Control Arm

The URO Suspension Control Arm, part number 31121139999, is designed specifically for select BMW models including the 735i, 735iL, 740i, 740iL, 750iL, 840Ci, 850Ci, 850CSi, and 850i. This front left upper control arm is engineered to maintain precise suspension geometry and improve vehicle handling.

• Pre-greased for immediate installation
• Includes durable bushings for enhanced stability
• Equipped with a bolt-in ball joint featuring a threaded stud
• Ball joint bearing made of metal with a high strength steel housing
• Neoprene dust boot in black included to protect joint components
• Locking nut included for secure assembly
• Control arm weight: 2.78 lbs
• Ball stud thread size: M14x1.50 with 22mm nut wrench size

Detailed Product Description

The URO 31121139999 suspension control arm is a direct replacement part designed for the front left upper position on various BMW models. It comes pre-greased, eliminating the need for additional lubrication during installation. The control arm includes bushings that help absorb road vibrations and maintain suspension alignment. The ball joint is bolt-in type with a threaded stud, constructed from metal bearing material and housed in high strength steel for durability and reliable performance. A neoprene dust boot protects the ball joint from contaminants, extending the lifespan of the component. This control arm is not adjustable but offers a 45-degree adjustment range to accommodate suspension movement. The locking nut ensures the ball joint remains securely fastened under driving conditions.

Common Applications and Problem Resolution

• Restores proper suspension geometry on BMW 7 Series and 8 Series models
• Eliminates clunking noises caused by worn control arm bushings or ball joints
• Improves steering response and vehicle stability
• Addresses uneven tire wear due to suspension misalignment
• Replaces damaged or corroded front left upper control arm components

Installation Notes and Tips

Installation requires standard suspension tools including a 22mm wrench for the ball stud nut. Since the control arm is pre-greased and includes bushings and a dust boot, no additional lubrication is necessary. Ensure the locking nut is properly torqued to manufacturer specifications to maintain secure ball joint attachment. This control arm is designed for bolt-in installation, simplifying replacement on compatible BMW models.

Quality Assurance and Warranty

URO parts are manufactured to meet or exceed OEM specifications, using high strength steel and durable materials for long service life. The 31121139999 suspension control arm undergoes rigorous quality control to ensure fitment and performance. Warranty coverage details should be confirmed with the distributor or retailer at the time of purchase.