Powerflex PFR5-4621 Polyurethane Rear Axle Differential Front Mount Bush/Bushing for BMW E46 M3 & Z4M – Final Drive Carrier Front Position Performance Upgrade Replacement (OE 33172282484)

Powerflex Polyurethane Differential Front Mount for BMW E46 M3 and Z4M

Transform rear axle control on your BMW with this uprated polyurethane front mounting bush for the rear final drive. By replacing the soft, ageing factory rubber, this upgrade keeps the differential precisely located under load, delivering cleaner traction, sharper response and greater confidence on fast road and track.

• Part number: PFR5-4621
• OE reference: 33172282484
• Diagram position: 21
• Quantity in kit: 1 bush
• Warranty: Powerflex Lifetime Warranty

Why upgrade this mount

• Locks down the diff housing for a tighter, more connected rear end
• Reduces axle tramp and wheel hop during hard launches and aggressive driving
• Improves on‑throttle stability and lets you drive out of corners with confidence
• Maintains geometry for consistent tyre contact and predictable handling
• Polyurethane resists oil, heat and ageing for long-term performance

Real-world results

We run these mounts on our own cars and customer builds. Drivers consistently report crisper power delivery, less driveline shunt, better rear grip and a more planted feel on B-roads and track days alike.

Compatibility

• BMW E46 M3 - front mounting bush for the rear final drive
• BMW Z4M - front mounting bush for the rear final drive
• Fits the models listed above only

What is included

• 1 x polyurethane front mount for the rear differential
• All components as supplied by Powerflex for this location

Symptoms this solves

• Rear-end float and vague responses under acceleration
• Clunking or shunt from the drivetrain when taking up drive
• Wheel hop on rough surfaces and during hard launches
• Uneven tyre wear linked to excessive diff movement

Installation

Professional fitting recommended. Book with MJ Modifications in Warwickshire and request a quote at info@mjmodifications.co.uk.

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