Powerflex PFR5-4030 Dual-Mount Rear Differential Bracket for BMW 4 Series M4 F82 F83 (F8x) - Rear Diff Mount Upgrade

PFR5-4030 Twin-Mount Final Drive Brace for BMW M4 F82 F83

Stop axle tramp, tighten up the back end and put power down cleanly. The Powerflex PFR5-4030 converts the single rear final drive fixing into a robust two-point arrangement, using the spare mounting location on the factory tubular cradle. Ideal for F8x chassis BMW M4 (F82 coupe and F83 convertible), this diff support brace is the proven solution for quicker response off throttle and on throttle, reduced drivetrain wind-up and far fewer knocks under load.

If you launch hard, drive fast road, attend track days or run increased torque, the stock single fixing can allow the diff case to pivot. That means hop, vibration and premature bush wear. PFR5-4030 adds a second anchor point to lock the final drive in place, improving traction, consistency and reliability without making the car harsh.

Reasons to choose this M4 final drive support

• Twin-mount conversion limits torque reaction and rotation of the diff casing
• Crisper pedal pickup and tighter powertrain feel through corners and on shifts
• Reduces axle tramp and helps the tyres find grip under heavy acceleration
• Relieves stress on existing bushes and fixings to prolong service life
• Perfect for tuned cars, fast road builds, track use and drag strip launches

Built for strength, fit and durability

• CNC-machined 6082 high-tensile aluminium for a precise, rigid interface
• Black anodised finish for corrosion resistance and a factory-style look
• Optimised to handle high-load scenarios on standard or modified vehicles
• Compatible with the OE rear bush or paired aftermarket bushes
• Can be fitted without fully dropping the rear subframe to save time

In the box

• Powerflex PFR5-4030 twin-mount final drive brace
• M14 fixing bolt and thread locker
• Powerflex keyring

Recommended add-ons for the ultimate setup

• PFR5-4026 rear diff mounting bushes for the two rear locations
• PFR5-4025 front diff mounting bushes for the front locations

Who is it for

Owners seeking improved rear-end stability, cleaner launches and confident power delivery. We have installed this part on multiple F8x cars at MJ Modifications and the feedback is consistently outstanding, with customers reporting better traction, sharper response and a more planted feel from the back axle.

Professional fitting

Want it installed by specialists who know F8x cars inside out? Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Technical details

Part number: PFR5-4030

Diagram reference: 30

Series: Powerflex Road Series

Number of bushes in pack: 1

Replaces OEM reference: 33172284775

Chassis: BMW F8x platform. Designed for M4 F82 F83 and widely adopted across F8x M2, M3 and M4 builds.

Why Powerflex Road Series

Powerflex Road Series components are engineered to restrain unwanted suspension and drivetrain movement for better road holding, improved steering and more predictable behaviour. Benefits include extended tyre life, enhanced performance and excellent long-term value.

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