The BMW 135i is a beloved model among car enthusiasts, known for its sporty handling and performance. However, as power upgrades become more common, the stock differential may struggle to handle the increased demands. Enter the Ford 8.8 differential, a robust and cost-effective upgrade that promises better durability and performance. This guide will explore the process of swapping the 135i axle onto the Ford 8.8 differential, highlighting its benefits and providing a detailed step-by-step installation guide.
Benefits of the Ford 8.8 Differential
- Increased Durability and Performance: The Ford 8.8 differential is renowned for its strength and ability to handle high torque and horsepower. It’s a popular choice among drag racers and those who push their cars to the limit.
- Better Handling of Higher Horsepower and Torque: With the Ford 8.8, you can safely increase the power output of your 135i without worrying about differential failure. It provides a more robust platform for substantial performance upgrades.
- Cost-Effectiveness: Compared to BMW’s OEM parts, the Ford 8.8 offers a more budget-friendly solution without compromising on quality. Its widespread availability and aftermarket support make it a practical choice for many enthusiasts.
Components Required For The Swap
To successfully swap the 135i axle onto the Ford 8.8 differential, you’ll need the following components:
- Ford 8.8 Differential: The core component of the swap.
- Adapter Brackets: Essential for mounting the Ford differential to the BMW subframe.
- Custom Driveshaft: A driveshaft tailored to connect the Ford differential to the BMW.
- Billet Axle Stubs: Necessary for connecting the BMW axles to the Ford differential.
- LSD Options: Depending on your preference, you may opt for a limited-slip differential for better traction.
Step-By-Step Guide to The Swap
Preparation:
- Gather All Tools and Parts: Ensure you have all the necessary components and tools before starting the swap.
- Elevate the Car and Secure It on Stands: Safely lift the car using a jack and secure it with stands to provide enough clearance for the swap.
Removing the Old Differential:
- Disconnect Driveshaft: Start by disconnecting the driveshaft from the differential.
- Remove Axle Shafts: Next, remove the axle shafts connected to the differential.
- Take Out the Old Differential: Unbolt and carefully remove the old differential from the subframe.
Installing the Ford 8.8 Differential:
- Fit the Adapter Brackets: Attach the adapter brackets to the Ford differential, ensuring a secure fit.
- Install the New Driveshaft: Connect the custom driveshaft to the Ford differential.
- Mount the Differential: Secure the Ford differential into the BMW subframe using the adapter brackets.
- Connect Axle Shafts to the New Diff: Attach the BMW axle shafts to the Ford differential using the billet axle stubs.
Final Adjustments:
- Check All Connections: Ensure all bolts and connections are tight and secure.
- Fill with Appropriate Differential Fluid: Fill the differential with the recommended fluid to ensure smooth operation.
- Test for Any Leaks and Ensure Proper Operation: After installation, test the differential for leaks and proper functionality by taking the car for a test drive.
Challenges and Considerations
- Compatibility Issues: One of the main challenges of this swap is ensuring compatibility between the BMW and Ford components. Proper measurements and quality adapter brackets are crucial for a successful swap.
- Modifications Needed for a Perfect Fit: Minor modifications may be required to achieve a perfect fit. This might include trimming or adjusting certain parts to ensure everything aligns correctly.
- Potential Impact on Vehicle Dynamics: The swap may affect the handling and dynamics of your 135i. It’s important to understand these changes and adjust your driving accordingly.
- Professional Assistance vs. DIY: While this guide provides a comprehensive overview, seeking professional assistance is recommended if you’re not confident in your mechanical skills. A professional can ensure the swap is done correctly and safely.
Conclusion
Swapping a Ford 8.8 differential into a BMW 135i can significantly enhance performance and durability, especially for high-powered or track-driven cars. The benefits of increased robustness and better handling make it a worthwhile investment. However, it is essential to approach the swap with careful planning and consideration of potential challenges. For the best results, consider seeking professional help or detailed guidance from experienced enthusiasts. This swap not only boosts performance but also offers a cost-effective solution for maintaining the reliability of your 135i.
By following this guide, you can confidently upgrade your BMW 135i to handle more power and provide a better driving experience, ensuring your car remains a top performer on the road or track.
Read More – BMW Spec Check – Easy Steps to Check
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