Powerflex Black Series Rear Diff Mounting Bush - F8x/G8x M2/M3/M4

Powerflex Black Series Rear Diff Rear Mounting Bush

For dedicated track and race use, the Powerflex PFR5-4026BLK Black Series Rear Diff Rear Mounting Bush is the ultimate step up from the Street version. Featuring Powerflex's Black 95A durometer polyurethane compound, Black Series bushes are 25% stiffer than Street bushings, delivering maximum control of chassis geometry and the most precise, accurate differential alignment available.

This replacement bush features a built-in support washer for added stability of the differential under acceleration, further reducing drivetrain deflection and wheel-hop during hard launches. Housed in Black anodised 2011-T6 aluminium, it's a direct, exact-fit replacement for the aged OE rubber mount, and can be paired with our PFR5-4030 Dual-Mount Rear Differential Bracket to run two bushes across both factory mounting positions for maximum differential control on track.

Note: Black Series bushes are firmer and more direct than the Street range, so expect increased NVH (noise, vibration, harshness) through the cabin. Best suited to dedicated track/race cars rather than daily-driven street cars — see our Street PFR5-4026 for a road-friendly alternative.

Fitment: BMW F8x/G8x M2/M3/M4 (F87/G87 M2, F80/G80 M3, F82/F83/G82/G83 M4)

Features:
- Black 95A durometer polyurethane - 25% stiffer than Street bushes
- Black anodised 2011-T6 aluminium housing
- Built-in support washer for maximum diff stability
- Designed for track, race, and rally use
- Direct, exact-fit OE replacement
- Compatible with PFR5-4030 dual-mount bracket for a two-bush setup

Important Information: This product is intended for performance use and should be installed by a qualified professional. It is the customer's responsibility to ensure compatibility with their specific vehicle prior to purchase. If you are unsure, please contact us before ordering. Gridline Custom Motorsports is not responsible for issues arising from incorrect installation, misuse, or improper product selection. Due to the nature of performance parts, some items may be special order and subject to supplier availability and lead times.