Front Upper Control Arm Inner Bushings
Designer: Power Flex
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These urethane performance bushings replace the stock rubber upper control arm bushings on the 1997-2003 E39 540i & M5. This arm is also known as the traction strut or tension strut. It's the curved arm in the front suspension, not the straight arm (wishbone). Stock rubber traction strut bushings give a disconnected and mushy feel to the front suspension, especially when worn as the bushing deflects more than it should. You get sloppy steering, vibrations, and poor handling which makes the car feel unstable. These urethane bushings are stiffer than stock rubber and will not deflect as much. This helps keep the alignment in check with less variation. The car feels more planted and confidence-inspiring. And a limited lifetime warranty means you'll likely never have to pay for another bushing ever again.
Sold as a pair for both E39 front upper control arms. Replaces BMW part numbers 31120006482, 31129071085, 31129069829, 31129068734, and 31121141752.
Unlike other urethane bushings using only one or two urethane grades, Powerflex design engineers choose the correct hardness to allow for the specific movement or rigidity required for each component while minimizing unwanted NVH. Bushings are typically produced in one of three grades – Yellow (70-80A, approximately 25% stiffer than stock), Purple (80-90A, approximately 30% stiffer than stock), and Black (90-95A, approximately 80% stiffer than stock). We have found that the Black Series bushings perform the best on the 540i/M5 control arms, giving much greater precision and response with no impact on ride comfort.