BMW E31 Upgraded lower ball joint bushing (Set of 4) Old BMW Part number for reference: 33321135131

The original E31 BMW Lemforder-supplied ball joint bushings are known for a significant longevity issue. The transparent plastic material utilized in the original bushing boots fails to withstand environmental factors, leading to rapid cracking and subsequent dirt infiltration that compromises the integrity of the bushing.

It was surprising to observe that nearly every rear OEM ball joint bushing on my 59,000-mile 850ci was torn, only five years and an additional 6,000 miles after a complete rear subframe refresh.

In response to this issue, we have implemented proven polyurethane rubber in the upgraded ball joint, which is engineered to endure environmental conditions for decades. This ball joint bushing has been meticulously designed from the ground up using the highest quality materials, ensuring it can support the weight requirements of the E31 while perfectly matching OEM dimensions for a seamless installation.