E39 Non-M Sedan Polyurethane Rear Trailing Arm Bushings (RTAB) - 33321091335 / 33321091336 , 33326757315 / 33326757316 Description The BMW E39, known for its balance of comfort, build quality, and excellent driving dynamics, continues to be a popular choice of mid-size sedan amongst driving enthusiasts. As these vehicles age, suspension components such as the rear trailing arm bushings (RTAB) — also referred to as rear lower swing arm bushings — often wear out, negatively affecting handling and ride quality. Replacing these with polyurethane bushings has become a common upgrade in recent years, offering several performance benefits over OEM rubber counterparts. Why Upgrade to Polyurethane? OEM rubber bushings are designed to absorb vibrations and allow controlled flex / toe-in under load. However, they degrade over time, leading to excessive and unwanted suspension movement, imprecise handling, and uneven tire wear. Polyurethane bushings, by contrast, provide greater stiffness and durability, which translates into: Improved Handling Response: Firmer poly bushings reduce unwanted suspension flex, improving alignment stability during cornering and braking, Longer Lifespan: Polyurethane resists cracking, rotting, and deformation over time much better than rubber, especially under performance driving conditions. Better Road Feedback: Enthusiasts appreciate the more connected feel polyurethane bushings bring, enhancing driver confidence. Replacing the E39's rear lower swing arm bushings with polyurethane is a cost-effective upgrade for those seeking sharper handling and longer-lasting suspension components. Whether you're restoring your daily driver back to its former glory, or building a more capable canyon carver, polyurethane RTABs are a great step towards improved performance. Installation Upgrading to polyurethane bushings requires pressing out the old rubber units and installing the new bushings — a task that can be done with a typical BMW bushing removal cup kit or a hydraulic press. The Garagistic Polyurethane E39 RTABs can be pressed or tapped into place when installing into the the swing arm bushing housings. It’s important to lubricate polyurethane bushings properly with a silicone PTFE grease to prevent squeaking or unwanted noise. While polyurethane offers performance advantages, it does transmit more vibration and noise into the cabin compared to rubber. For a daily-driven E39, this trade-off is generally minimal with high-quality polyurethane, but it’s worth considering based on your comfort preference. Fitment WILL THESE POLYURETHANE TRAILING ARM BUSHINGS FIT ON MY E39? Fits: All E39 Non-M Sedan Models (525i, 528i, 530i, 540i) Direct Replacement for BMW part no. 33321091335 / 33321091336 & 33326757315 / 33326757316 Note: The following E39 models below will fit with modification: E39 Wagon Models (528i Touring, 540i Touring) will need to drill out the rear bushing to M14 Swing Arm OEM part #'s 33321093723 , 33321093724 E39 M5 Models will need to drill out the rear bushing to M14 Swing Arm OEM part #'s 33322229515 , 33322229516 Included One kit (4pcs) is required per car, no need to order front & rear bushings separately These bushings are an 80A durometer polyurethane Lifetime Warranty Guarantee We stand by our products 100%. Our polyurethane bushings do not degrade over time like OEM rubber bushings, and they have superior resistance to heat, exposure to elements, and abrasion wear. If for any reason, the bushings need to be replaced, simply send us your old bushings and we will replace with new ones at no cost!
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