Powerflex Black Series 95A Rear Differential Front Mount Insert for BMW 4 Series F32 F33 F36 | PFR5-1927BLK | Polyurethane Diff Bush/Bushing Void Filler Upgrade Track Fast Road | Replaces OE 33316792513

PFR5-1927BLK Powerflex Black 95A Rear Differential Front Mount Insert for BMW 4 Series F32 F33 F36

Sharpen your BMW 4 Series driveline with this motorsport-grade rear differential front mount insert from Powerflex. Part number PFR5-1927BLK is a polyurethane void-filler that supports the original front diff mount, reducing movement under load for crisper launches, tighter gear changes and improved traction on fast road and track.

Manufactured in the Black 95 Shore A compound, this hard-wearing poly insert is designed to control diff housing movement without the cost of a full bush replacement. By filling the cavities in the OE mount, it helps tame wheel hop and drivetrain shunt, giving a more connected, predictable rear end on the F32 Coupe, F33 Convertible and F36 Gran Coupe.

Key reasons to choose this upgrade

• Motorsport-focused 95A polyurethane for firmer differential location and consistent torque delivery
• Insert design supports the OE mount by filling voids for a cost-effective performance gain
• Helps reduce axle tramp, wheel hop and lash during hard launches and aggressive upshifts
• Improves stability under power and mid-corner composure on track days and spirited driving
• Durable, oil- and road-grime resistant material for long service life

What you will notice

• More immediate throttle-to-tyre response and better traction out of bends
• Cleaner power delivery with less diff wind-up during acceleration
• A tighter, more controlled rear axle feel

Technical information

• Part number: PFR5-1927BLK
• Material: Powerflex Black polyurethane — 95 Shore A
• Pack contents: 2 inserts
• Diagram reference: 27
• OE number it works with: 33316792513 (fits into the original mount)
• Fitment style: Insert that fills OE bush voids to reduce differential movement

Vehicle fitment

BMW 4 Series F32 Coupe, F33 Convertible, F36 Gran Coupe. If you would like us to confirm fitment for your exact model and build year, contact our team.

Installation and support

Want it fitted by specialists who know these cars inside out? MJ Modifications in Warwickshire offer professional installation and setup. Request a fitting quote at info@mjmodifications.co.uk.

Tried and trusted by enthusiasts

We run this insert on our own builds and customer cars. Owners consistently report a more planted rear end and improved confidence when pushing on, especially under hard acceleration and repeated hot laps.

Search-friendly terms

BMW F32 F33 F36 rear differential mount insert, BMW 4 Series diff front mount bushing, Powerflex PFR5-1927BLK poly insert, 95A polyurethane diff mount, rear diff void filler, drivetrain mount upgrade, BMW 4 Series axle tramp fix, BMW F3x diff mount reinforcement, performance diff mount insert, uprated driveline bush, track day differential mount, fast road rear diff bushing, replaces OE 33316792513.