01
Real experience
We test before we recommend.
PRODUCT DESCRIPTION
Are you considering changing your BMW's differential gear ratio? Our gear ratio change kit is a must-have, as it includes all the necessary components for a successful change and to improve your vehicle's performance.
Key Features:
Complete Kit: This kit includes everything needed for a smooth gear ratio change, ensuring precise fitment and optimal operation.
Improved Performance: Adjusting the gear ratio can lead to significant improvements in acceleration, top speed, and overall driving, adapting to your driving style.
The kit includes:
Adjustment Shim Set / C-clip Set: Ensures correct alignment and positioning of internal components.
Pinion Oil Seal: Maintains optimal lubrication and prevents oil leaks.
Large Pinion Bearing: Necessary for installation on the new pinion.
Crush Sleeve Shim: Essential for achieving the correct pinion preload.
Pinion Depth Shim Set (3.3 mm - 3.7 mm): Allows for precise pinion positioning.
Compatibility Confirmation: To ensure you get the correct kit for your BMW, follow these steps:
VIN Confirmation: Simply send us the last 7 digits of your VIN, and we will confirm as soon as possible if this kit meets your requirements.
Why choose our gear ratio change kit?
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 make the change with complete confidence.
Backlash Adjustment Shims. OEM Part Numbers:
-168 mm-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-----------------------188 mm-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










WHY THETUNERLAB
We have spent years building cars, racing, and testing the exact same parts that we sell.
01
We test before we recommend.
02
We help you choose the right part.
03
Only trusted manufacturers.
04
Before and after the purchase.
+10 years
of passion for drifting
+30.000
available products
+5.000
satisfied customers
24/7
passion for motoring
Each product indicates compatible models in the product description. If you have any questions, you can contact us and we will help you choose your best option.
-If the product is in stock, the usual delivery time is 2 to 5 working days.
-If the product is out of stock, the delivery time is 7 to 15 working days.
All our products come with the manufacturer's official warranty and comply with current regulations.
Yes. We ship orders to Spain and most European countries using specialized transport agencies.
You can contact our team via WhatsApp, email, or our website's contact form.
Shipping costs depend on the type of product, its weight, dimensions, and the destination country. In most cases, the amount is calculated automatically during the checkout process before the order is finalized.
For some products, especially large items or those with special characteristics, shipping costs may require a manual review. If the amount shown does not match the actual shipping cost, we will contact you before processing the order to inform you of the final cost and request your confirmation before proceeding. We will never charge any additional fees without your authorization.