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

The Powerflex PFR5-1927 Rear Diff Front Bush Insert is a Road Series polyurethane insert designed to stiffen the front differential mount on the BMW F2X/F3X platform, including the M135i, M140i, M235i and M240i. This insert fills the voids inside the factory rubber bush to reduce diff movement and improve drivetrain control without the harshness of a full replacement bush.

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

Key Features

Road Series Polyurethane

– Firmer than OEM rubber while keeping comfort
– Fills the voids in the factory diff bush
– Reduces unwanted diff movement under torque

Improved Drivetrain Response

– Sharper throttle pickup
– Reduced diff “slap”
– Better traction during launches and gear changes

Better Rear-Axle Stability

– Keeps the differential correctly aligned
– Improves corner exit stability
– More predictable behaviour under load

Easy Installation

– Inserts into the OEM bush (no pressing required)
– Minimal NVH increase
– Ideal first step before full diff bush upgrades

Benefits

The PFR5-1927 insert tightens up the rear drivetrain feel on the F2X/F3X platform, making the car feel more direct and more composed during hard acceleration. Perfect for Stage 1/2 tuned M-Lites or drivers wanting a cleaner drivetrain response without going to a full Black Series bush.

Fitment

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

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

Installation Notes

– Fits directly into original OEM diff bush
– No press tools or removal required
– Quick and cost-effective upgrade
– Professional fitting recommended for best results

About Powerflex

Powerflex is a leading manufacturer of performance polyurethane suspension components. Their Road Series bushes provide improved stability, longevity and control while maintaining driver comfort — ideal for fast-road BMW builds.