Bmw X3M F97 X4M F98 Rear Differential Bush Bolt Collar Upgrade, Complete Diff Kit Exclusive Fj Motorwerkes

The only ultimate complete kit on the market - Uprated Diff Bolt, End Bushing & collar kit, fix For Bmw X3M/X4M Exclusive to Fj Motorwerkes.

Our latest kit is now UK made, using premium CNC machine engineering and steel components.

Experience the enhanced performance of your X3M & X4M F97 F98 with our premium uprated differential bolt, bush & collar kit.

Common issues like diff bolt is no longer a concern. Whether you enjoy drifting, launching, or aggressive driving, our kit ensures a smooth and reliable experience.

Our kit greatly reduces the risk of bolt failure, providing peace of mind for high-performance driving and power, bolts are known to deform on any level including stock. Whether your car is stock power or tuned this is the true complete kit to reduce potential failure causing ££££’s in damages (Diff failure, driveshafts etc etc).

Complete Kit includes:

• Extreme strength, upgraded-sized bolt 
• Reinforced custom end solid bushing
• Reinforced & strengthened CNC collar
• Reinforced CNC front washer
• Reinforced CNC crush washer
• Reinforced CNC step down bushing
• Grooved fast lock nut
• Drill bit for installation
• Full instructions

Our upgraded bolt is over 39% stronger than the BMW revised bolt and significantly more durable than the original BMW part. To be precise our bolt can take 170,000 psi pressure (Extreme strength bolt). Paired with our solid end bushing to create seamless fix.

Full fitting instructions - Installation time 1.5hrs.

We have fitting partners nationwide, charge to fit £130/£180. Dependent on garage. Contact us through instagram for more details or email us.

These are tested kits, not many owners know the true condition of their current bolt due to location, very high ratio who do remove confirm failure (Bent), whilst other vehicle’s make clunking sound or grinding/whining which reflects the bolt being nearer the end of it’s life - Do not wait around for sounds, this can cause pre mature wear on other components. We advise this fix. 

Bmw are aware of issue, they revised bolt in late 2021 but unfortunately it’s proven unsuccessful.

While we recognise other offerings “solid bushings” or “lockdown braces”. Based on firsthand feedback on our test vehicles. Those solutions may create excessive noise and vibrations in the cabin at low speeds, making daily driving uncomfortable. Additionally, lack of flexibility, which can lead to component failure over time. Solid bushings are best suited for track vehicles.

NOTE: These bolts are tested on vehicles worldwide from stock, stage 1, stage 2 and stage 3 vehicles, sold 100’s units worldwide and proven highly successful.

We also supply many of the UK’s leading tuner’s and garage’s, should you want to know if they stock simply ask us.

See our dealer DRW & Youtuber Chris Slix - installing our FJ M Diff bush bolt collar kit on his 800BHP X3M Comp! Copy Link into browser: https://youtu.be/I2CsvsotYXE?si=186OcRu0zR2V0lyn

 See our other listing for SUPPLY & FIT service.

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