The 335i diff retrofit Ford vehicles involves installing a BMW 335i limited-slip differential to enhance traction, handling, and acceleration. This upgrade is particularly popular among Ford Mustang enthusiasts for improved performance.
In this article, we will delve into the details of the 335i diff retrofit Ford, exploring its compatibility, advantages, installation process, and overall impact on performance.
What Is It and Why Upgrade?
Before diving into the specifics of the 335i diff retrofit Ford, it’s essential to understand what a differential is and its role in a vehicle’s performance. The differential is a critical component of the drivetrain, responsible for transferring power from the engine to the wheels while allowing them to rotate at different speeds. This is especially important during turns, where the outside wheels travel a greater distance than the inside wheels.
There are two primary types of differentials: open and limited-slip. An open differential allows one wheel to spin freely, which can lead to loss of traction, especially in slippery conditions. In contrast, a limited-slip differential (LSD) transfers power more effectively between the wheels, providing improved traction and handling. The BMW 335i is equipped with a high-quality LSD, making its differential an appealing choice for Ford enthusiasts looking to enhance their vehicles.
Why the BMW 335i Diff?
The decision to retrofit a BMW 335i differential into a Ford vehicle stems from several factors:
- Performance and Traction: The LSD in the 335i diff retrofit Ford ensures that power is distributed more evenly between the rear wheels, leading to better traction during acceleration and cornering. This is particularly beneficial for high-performance driving or when taking tight turns.
- Gear Ratios: The 335i differential often features gear ratios that are favorable for performance driving, allowing for quicker acceleration and improved throttle response. This can make a significant difference in how the vehicle feels and performs on the road or track.
- Durability: BMW is known for engineering robust components, and the 335i diff is no exception. By upgrading to this diff, Ford owners can benefit from improved durability and reliability, especially if the vehicle is frequently driven hard.
- Community Knowledge: The automotive community has embraced the 335i diff retrofit, leading to a wealth of knowledge and resources available for enthusiasts. From installation guides to troubleshooting tips, the shared experiences of others can be invaluable.
Compatibility: Which Ford Models Can Benefit?
While the 335i diff retrofit Ford retrofit is primarily associated with Ford Mustangs, it can also be applied to other rear-wheel-drive Ford models. However, the retrofit’s feasibility can vary based on specific model years and configurations. Here are some Ford models that are often considered for the 335i diff retrofit:
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- Ford Mustang: The Mustang is the most popular choice for this retrofit due to its performance-oriented design and rear-wheel-drive layout. The 335i diff can significantly enhance the Mustang’s handling and acceleration.
- Ford Falcon: In markets like Australia, the Ford Falcon is a common choice for enthusiasts. The 335i diff retrofit Ford can provide similar performance benefits as it does for the Mustang.
- Ford Crown Victoria: Although it may seem unconventional, some enthusiasts have experimented with retrofitting the 335i diff retrofit Ford into the Crown Victoria, particularly those who want to enhance performance in a full-size sedan.
The Retrofit Process: Installation and Modifications
Installing a 335i diff retrofit Ford into a Ford vehicle is not a straightforward plug-and-play process. It requires careful planning, fabrication, and expertise. Here’s a breakdown of the key steps involved in the retrofit:
Sourcing the Differential
The first step in the retrofit process is to acquire a BMW 335i differential. This can be done through various channels, including salvage yards, online marketplaces, or performance parts suppliers. It’s essential to ensure that the differential is in good condition and compatible with the intended Ford model.
Preparing the Vehicle
Before beginning the installation, the vehicle should be properly prepared. This includes lifting it securely and removing the existing differential. The removal process may require disconnecting the driveshaft, suspension components, and axles.
Custom Fabrication
One of the most critical aspects of the retrofit is custom fabrication. The mounting points for the 335i differential may not align with those in the Ford vehicle, necessitating the creation of custom mounts. Additionally, modifications to the driveshaft and axles may be required to ensure a proper fit.
Installation
Once the custom mounts and any necessary modifications are completed, the installation of the 335i diff retrofit Ford differential can proceed. This includes securing the differential in place, reconnecting the driveshaft, and reassembling any suspension components that were removed.
Final Adjustments and Testing
After the installation is complete, it’s essential to make final adjustments and perform a thorough inspection. This may include checking for proper alignment, ensuring that all connections are secure, and verifying fluid levels in the differential. Once everything is in order, it’s time to take the vehicle for a test drive to evaluate the performance of the new setup.
Performance Benefits of the 335i diff retrofit Ford
Enthusiasts who have completed the 335i diff retrofit Ford often report a variety of performance benefits. These improvements can make a significant difference in the driving experience:
1. Enhanced Traction
With the LSD in the 335i differential, power is distributed more effectively between the rear wheels. This leads to improved traction during acceleration, especially in low-grip conditions. Whether on a track or a winding road, drivers can expect more controlled and confident handling.
2. Improved Acceleration
The favorable gear ratios found in the 335i diff can result in quicker acceleration times. This improvement is particularly noticeable during spirited driving or racing scenarios, where every fraction of a second counts.
3. Better Handling
The combination of enhanced traction and improved weight distribution can lead to better handling characteristics. Drivers often report a more responsive and engaging driving experience, with the vehicle feeling more planted during turns.
4. Increased Durability
The robust construction of the BMW 335i differential means that it can withstand the demands of high-performance driving. This added durability can provide peace of mind for enthusiasts who push their vehicles to the limit.
5. Unique Driving Experience
One of the most significant advantages of the 335i diff retrofit is the unique driving experience it offers. The combination of a Ford chassis and a BMW differential creates a vehicle that feels distinct and special, setting it apart from factory configurations.
Considerations and Challenges
While the 335i diff retrofit Ford offers numerous advantages, there are some considerations and challenges to keep in mind:
Cost
The cost of sourcing a 335i differential, along with any necessary fabrication and installation, can be significant. Enthusiasts should budget accordingly and be prepared for potential unexpected expenses.
Complexity of Installation
The retrofit process is not for the faint of heart. It requires advanced mechanical skills, custom fabrication, and potentially the assistance of a professional shop. Enthusiasts should assess their capabilities before attempting the retrofit themselves.
Warranty and Insurance
Modifying a vehicle can impact its warranty and insurance coverage. It’s crucial to check with the manufacturer and insurance provider to understand any potential ramifications of the retrofit.
Compatibility with Other Modifications
If the vehicle has other performance modifications, it’s essential to consider how the 335i diff will interact with them. Proper tuning may be necessary to ensure that all components work harmoniously together.
FAQs:
1. What vehicles can use the 335i diff retrofit?
The retrofit is commonly applied to rear-wheel-drive Ford models, especially the Mustang, but it can also be used with other models like the Ford Falcon.
2. What are the benefits of the 335i diff retrofit?
The retrofit improves traction, acceleration, and overall handling due to the high-quality limited-slip differential and favorable gear ratios from the BMW 335i.
3. Is the installation of the 335i diff complex?
Yes, the installation requires custom fabrication and mechanical expertise, so it’s often best done by experienced professionals.
4. How much does a 335i diff retrofit typically cost?
Costs can vary widely based on sourcing the differential, fabrication, and installation labor, but enthusiasts should budget for several hundred to a couple of thousand dollars.
5. Will the retrofit affect my vehicle’s warranty?
Yes, modifying your vehicle may void certain aspects of the warranty, so it’s essential to check with the manufacturer before proceeding.
Conclusion:
The 335i diff retrofit Ford is a thrilling modification that can significantly enhance Ford vehicles’ performance and driving experience, particularly the Mustang. By incorporating a high-quality limited-slip differential from the BMW 335i, enthusiasts can unlock many benefits, including improved traction, better handling, and increased acceleration.
Richard 
anas