Superpro SPF4330K Differential Pinion Mount Bush Kit for 99-16 BMW 3/Z4

Vehicle Fitment

• 1998-2006 BMW 3 Series (E46) - 316i/318i/323i/323Ci/325i/325Ci/328Ci/330i/330Ci (Various Engines, RWD/AWD)
• 2003-2016 BMW Z4 (E85/E86/E89) - sDrive18i, 2.5i, 3.0i, 3.0si, sDrive28i, sDrive30i, sDrive35i, sDrive35is (Various Engines, RWD) 

Features

• Rear differential pinion mount polyurethane bushing kit
• Replaces worn OEM rubber bushings for improved drivetrain stability
• Reduces differential movement under acceleration and cornering
• Improves rear-end response and handling precision
• Engineered for durability and performance over stock components
• Polyurethane resists oil, water, and environmental degradation
• Precision molded for direct fit installation
• Lifetime warranty on polyurethane components :contentReference[oaicite:1]{index=1}

Specifications

• Part Number: SPF4330K
• Position: Rear Differential Pinion Mount Bushings
• Material: Premium polyurethane with metal sleeves and washers
• Compatibility: RWD/AWD depending on specific chassis
• Kit Contains: 5 bushings, 3 tubes, 5 washers 
• Installation: Rear differential mount area; alignment recommended after service

Included Components

• 5x Polyurethane differential bushings
• 3x Metal sleeves
• 5x Washers

Product Description

The Superpro SPF4330K Differential Pinion Mount Bush Kit is engineered as a direct upgrade to the factory rubber mount bushings that locate the rear differential on select BMW 3 Series (E46) and Z4 (E85/E86/E89) models from 1998 through 2016. Stock rubber bushings can deteriorate over time, leading to unwanted differential movement, slower throttle response, and ambiguous handling. This kit's polyurethane construction enhances drivetrain stability, providing more consistent power transfer under acceleration and improved rear-end response through corners.

Designed for everyday use and spirited driving alike, the SPF4330K kit includes multiple polyurethane bushings, metal sleeves, and washers for a complete rear differential pinion mount solution. Polyurethane's durability and resistance to oil, water, and environmental wear delivers a longer service life compared to stock components, while maintaining NVH levels closer to OEM behavior. Installation involves replacing the factory mount bushings at the rear differential; a follow-up alignment or test drive ensures optimal performance. Fitment is confirmed for applicable 3 Series (E46) and Z4 models through 2016. Coverage beyond 2016 is unconfirmed at the time of this listing and may depend on specific model variants and drivetrain configurations. Always verify with your VIN or manufacturer fitment guide before installation.