PFR5-1927BLK – Rear Diff Front Insert – M135i M140i M235i M240i

The Powerflex PFR5-1927BLK Rear Diff Front Bush Insert is a Black Series polyurethane insert designed to stiffen the front differential mounting point on BMW F2X/F3X models, including the M135i, M140i, M235i and M240i. This insert reduces diff movement, sharpens drivetrain response and improves traction under load — all without needing to press out the factory bush.

SKU: PFR5-1927BLK
Position: Rear Differential – Front Bush Insert

Key Features

Black Series Polyurethane

– Maximum stiffness for fast-road, track and high-power builds
– Fills the voids in the OEM diff bush
– Reduces unwanted diff movement under acceleration

Sharper Drivetrain Response

– Faster throttle reaction
– Reduced diff “slap”
– More consistent torque transfer to the rear wheels

Improved Rear-End Stability

– Keeps the diff correctly aligned
– Improves traction during launches and gear changes
– Enhances stability during aggressive driving

Easy, Effective Upgrade

– Inserts into the factory bush (no pressing required)
– Lower NVH increase than a full replacement bush
– Perfect first step before upgrading all diff bushes

Benefits

The PFR5-1927BLK insert transforms drivetrain stability on the F2X/F3X platform. By removing the slack in the OEM diff mount, the car feels tighter, cleaner and more predictable under load — ideal for tuned M135i/M140i/M235i/M240i builds.

Fitment

Suitable for:
– BMW M135i (F20/F21)
– BMW M140i (F20/F21)
– BMW M235i (F22/F23)
– BMW M240i (F22/F23)
– Also fits many non-M-Lite F2X/F3X RWD models

SKU: PFR5-1927BLK
Position: Rear Differential – Front Insert

Installation Notes

– Fits into OEM front diff bush
– No press tools required
– Quick installation
– Light NVH increase is normal
– Professional fitting recommended

About Powerflex

Powerflex Black Series components are designed for motorsport use, offering maximum stiffness and improved control under extreme conditions. Perfect for high-power BMW M-Lite applications.