SuperPro Rear Upper Forward Differential Pinion Mount Bushing Kit for Select BMW 1999-2021 (SPF4330K)

Fits select 1999-2021 BMW 3 Series (323i, 325i, 328i, 330i) and Z4 models. This SuperPro bushing kit (SPF4330K) is engineered to replace the factory forward differential mount bushings, often referred to as the pinion mount bushings.

Original equipment (OE) units utilize soft natural rubber that degrades over time, especially under spirited driving or high-torque loads. This wear leads to excessive differential movement, which manifests as sluggish throttle response, driveline clunks, and unwanted vibrations. SuperPro’s proprietary material provides a significant upgrade by more accurately locating the differential without the harsh noise, vibration, and harshness (NVH) typically associated with harder performance bushings.

• Improved Response: Eliminates the "sloppy" feeling during acceleration and deceleration by securing the pinion angle.
• Durability: Engineered to resist softening and degradation caused by environmental factors and mechanical stress.
• Ride Quality: Maintains factory-like cabin comfort while providing superior performance over OEM rubber.
• Manufacturer Part Number: SPF4330K

Vehicle Fitment:
1999-2000 BMW 323i Base
2000 BMW 323Ci Base
2001-2005 BMW 325i Base
2001-2006 BMW 325Ci Base
2000 BMW 328Ci Base
2001-2005 BMW 330i Base
2001-2006 BMW 330Ci Base
2003-2005 BMW Z4 2.5i & 3.0i
2006-2008 BMW Z4 Roadster/Coupe 3.0i/3.0si
2006-2008 BMW Z4 M Coupe & M Roadster
2009-2016 BMW Z4 sDrive28i, sDrive30i, sDrive35i, sDrive35is
2019-2021 BMW Z4 sDrive30i