StrongArm 4539 Trunk Lid Lift Support

Trunk Lid Lift Support for BMW Applications

Restore steady trunk lid operation with this StrongArm trunk lid lift support, part number 4539. It is a specific-fit gas strut engineered for select BMW 5 Series and M5 applications, including BMW 525i, 530i, 540i, 528i, and M5 models from 1997-2003.

• Specific-fit trunk lid lift support for select BMW vehicles
• Extended length: 13.09 in.; compressed length: 9.34 in.
• Stroke length: 3.75 in. for controlled opening and closing movement
• Maximum force rating: 121.0
• Black steel outer cylinder with rubber and Teflon materials
• End fittings: 10mm nylon ball socket and 8mm threaded connection
• Cross-reference: AMS Automotive 4539

Detailed Product Overview

StrongArm 4539 is a trunk lid lift support built for direct replacement in specific BMW trunk lid applications. The pressurized cylinder helps hold the trunk lid in position and provides smoother motion during opening and closing. Its steel outer cylinder, nylon ball socket end, and threaded 8mm end are matched to the listed fitment for consistent installation and operation. This part number 4539 is listed for BMW 525i and 530i from 2001-2003, BMW 540i with spoiler from 1997-2003, BMW M5 from 2000-2003, and BMW 528i from 1997-2000.

What This Lift Support Helps Address

• Trunk lid that drops too quickly
• Weak or failed lift support pressure
• Uneven or inconsistent trunk opening effort
• Difficulty keeping the trunk lid raised
• Worn gas strut performance on BMW 5 Series and M5 models

Installation Notes and Tips

Verify the vehicle’s year, model, and trunk configuration before ordering. This StrongArm 4539 uses specific-fit end connections, so match the existing mounting style to the listed ball socket and threaded ends. For safe, reliable support, replace lift supports in pairs when servicing the trunk lid system.

Quality Assurance

StrongArm lift supports are custom engineered and manufactured beyond industry standards to deliver smoother operation and longer service life. The brand’s manufacturing approach focuses on consistent pressure control and dependable trunk lid support for the listed BMW applications.