Reinforced OEM Differential Bush for F8X M2 / M3 / M4

A known weak point on the BMW F8X platform (M2, M2 Competition, M3, M4) is the factory rear differential mounting bush. The original oil-filled rubber bushing often fails over time, especially on tuned or track-driven cars — leading to unwanted drivetrain movement, knocking, and premature wear on surrounding components.

BMW clearly recognised the issue and introduced this updated OEM replacement (part number 33179503009) late in the production cycle. It features a reinforced steel and plastic core with a high-tech foam outer ring — a substantial improvement over the original soft rubber design.

This is a direct-fit solution offering increased durability and control without introducing excessive NVH, making it an ideal upgrade for fast road, track, and even tuned high-power builds.

Why Upgrade Your F8X Diff Bush?

• Replaces the factory oil-filled bush prone to tearing

• OEM BMW part with updated construction

• Steel and plastic core for improved strength

• Longer lifespan under high torque loads

• Reduces drivetrain movement and associated wear

• Compatible with both standard and tuned power levels

💡 Some enthusiasts refer to this as the “TU bush,” referencing BMW’s later technical update

Ideal for Use With Diff Lift Kits

This OEM bush is fully compatible with popular differential lift kits such as those from KMP and Millway Motorsport. If you're raising the diff to correct driveline angles or reduce CV stress, this bush provides the ideal balance of compliance and rigidity for reliable performance.

Compatibility

• BMW F80 M3

• BMW F82 / F83 M4

• BMW F87 M2

• BMW F87 M2 Competition

• Direct replacement for rear diff bush on all F8X M cars

Part Number:

BMW OEM 33179503009

Recommended With

• Millway or KMP diff lift kits

• Clubsport or track-use powertrain upgrades