Thinking of changing the gear ratio of your BMW differential? Our Gear Ratio Swap Set is an absolute must-have, providing all the essential components needed to complete a successful swap and enhance your vehicle's performance. Key Features: Complete Kit: This set includes everything required for a seamless gear ratio change, ensuring precise fitment and optimal functionality. Enhanced Performance: Adjusting your gear ratio can lead to significant improvements in acceleration, top speed, and overall drivability, tailored to your specific driving style. Kit Includes: Adjustment Shim Set / C Clip Set: Ensures proper alignment and positioning of internal components. Pinion Oil Seal: Maintains optimal lubrication and prevents oil leaks. Large Pinion Bearing: Necessary to install onto your new pinion gear. Crush Sleeve Shim: Essential for achieving the correct preload on the pinion gear. Pinion Depth Shim Set (3.3mm - 3.7mm): Allows for precise positioning of the pinion gear. Fitment Confirmation: To ensure you get the right set for your BMW, follow these steps: VIN Confirmation: Simply send us the last 7 digits of your VIN, and we will confirm if this set fits your requirements as soon as possible. Why Choose Our Gear Ratio Swap Set? Quality Assurance: Each component is manufactured to meet or exceed OEM specifications, ensuring long-lasting performance and reliability. Expert Support: We provide comprehensive guides and resources to help you perform the swap with confidence. Backlash adjustment shims OEM part numbers: -168mm-3313906573133-13-9-065-73133 13 9 065 73133.13.9.065.731 3313906573233-13-9-065-73233 13 9 065 73233.13.9.065.732 3313906573333-13-9-065-73333 13 9 065 73333.13.9.065.733-----------------------188mm-3313906573433-13-9-065-73433 13 9 065 73433.13.9.065.734 3313906573533-13-9-065-73533 13 9 065 73533.13.9.065.735-----------------------210mm-3313906573633-13-9-065-73633 13 9 065 73633.13.9.065.736 3313906573733-13-9-065-73733 13 9 065 73733.13.9.065.737