Best limited slip differential Ford 9-inch

Explore top-rated Ford 9-inch limited slip differentials for enhanced traction and control. Find the best options for your vehicle today.

When optimizing your vehicle’s performance and traction, a few upgrades are as essential as a top-quality limited slip differential (LSD) kit. A limited-slip differential is critical for enthusiasts and off-road adventurers, enhancing a vehicle’s stability, cornering ability, and overall control in challenging driving conditions.

The Ford 9-inch limited-slip differential is an iconic and highly regarded component in automotive engineering. Known for its durability, versatility, and superior performance characteristics, the Ford 9-inch LSD has become a top choice among automotive enthusiasts and professionals. In this exploration, we will delve into the world of limited-slip differentials and discover why the Ford 9-inch variant consistently stands out as one of the best options available, offering improved traction and handling that have left a lasting mark on the automotive industry.

In this guide, we will also explore the key factors to consider when selecting the best Ford 9-inch limited-slip differential and its benefits to your vehicle’s performance.

What Is a Limited Slip Differential, and Why Should You Consider Having One?

A limited-slip differential (LSD) is a crucial component in performance vehicles and off-road Trucks. It minimizes speed differences between the wheels that drive a vehicle when one loses grip. This automatic device enhances traction and stability without requiring any input from the driver, ensuring better control and performance, whether on the track or off-road.

In contrast to a conventional differential that directs torque to the slipping wheel, a limited-slip differential distributes torque more evenly between both half-shafts, helping maintain traction and stability even when one wheel loses grip.

Certainly, limited-slip differentials come in various types, and some can be electronically controlled while others are fully electronic. The mechanical ones have an electronic twist for added control, while fully electronic ones rely on the brakes when a wheel spins too fast. However, with the brake-based system, some of the power gets lost in braking instead of being redirected to another wheel. It’s a more budget-friendly option but doesn’t match the efficiency of a purely mechanical differential.

If your vehicle has an electronic limited-slip differential and you experience a flat tire, avoid using a spare tire of a different size. Doing so can deactivate or reduce the system’s functionality to prevent overheating and potential damage. It’s advisable to reinstall the original wheel with a new or repaired tire as promptly as possible to ensure proper operation.

Our Top 5 Picks in 2023

1. Auburn Gear 542043 Pro Series Limited-Slip Differential for Ford 9″– A High-performance Choice.
2. Yukon YDGF9-31-AG Duragrip Differential for Ford 9″– A Versatile Choice.
3. Yukon Gear & Axle 31-Spline Trac-Loc for Ford 9 Differential– A Compatible Choice.
4. Eaton 913A586 Detroit Truetrac 9″ 31 Spline Differential for Ford– A Versatile Design Choice.
5. Power Trax Ford 9 Inch 35 Spline Grip PRO Traction System– A Reliable Traction Choice.

1- Auburn Gear 542043 Pro Series Limited-Slip Differential for Ford 9″

The Auburn Gear 542043 Pro Series Limited-Slip Differential is a performance-driven upgrade designed specifically for the Ford 9-inch rear axle, known for its strength and versatility. This aftermarket differential is engineered to enhance traction and control in various driving scenarios, making it a popular choice among automotive enthusiasts and professionals alike.

One of the standout features of the Auburn Gear 542043 Pro Series LSD is its ability to provide power to both drive wheels while allowing for differentiation between them. This design ensures that torque is distributed efficiently, reducing the likelihood of wheel spin and helping maintain stability and control during acceleration, turns, and challenging road conditions.

The heart of this best limited-slip differential lies in its cone-clutch mechanism. This system enables smooth and seamless torque transfer between the drive wheels, allowing for improved traction without sacrificing drivability. Whether navigating off-road terrain or pushing the limits on the drag strip, this LSD ensures predictable and reliable performance.

Durability is a hallmark of Auburn Gear products, and the 542043 Pro Series LSD is no exception. It’s built to withstand high torque loads and demanding applications, making it a robust choice for those seeking improved vehicle performance and longevity.

The Auburn Gear 542043 Pro Series Limited-Slip Differential for the Ford 9-inch rear axle is a top-tier upgrade with enhanced traction, control, and durability. It’s a favored choice among automotive enthusiasts and professionals looking to optimize their vehicle’s performance, making it a reliable and valuable addition to any Ford 9-inch axle-equipped vehicle.

Why We Love It:

There are several compelling reasons to love the Auburn Gear 542043 Pro Series Limited-Slip Differential for the Ford 9-inch axle:

1. Enhanced Traction: This LSD significantly improves traction by distributing power to both wheels, reducing wheel spin, and ensuring better control in various driving conditions, from off-road adventures to high-speed racing.
2. Smooth and Predictable Performance: Thanks to its cone-clutch mechanism, the Auburn Gear LSD offers smooth and predictable torque transfer between the wheels, allowing for confident and precise handling during acceleration and turns.
3. Durability: Auburn Gear is renowned for its robust and durable components, and the Pro Series LSD lives up to this reputation. It’s designed to withstand high torque loads and demanding applications, ensuring long-lasting performance.
4. Tailored for the Ford 9-inch Axle:  This LSD is specifically engineered for the Ford 9-inch rear axle, ensuring a precise fit and compatibility that enthusiasts and professionals appreciate.
5. Enhanced Control: With improved traction and reduced wheel spin, this LSD enhances vehicle stability and control, allowing you to push the boundaries of your vehicle’s performance confidently.

What You Should Know:

While the Auburn Gear 542043 Pro Series Limited-Slip Differential for the Ford 9-inch axle offers several advantages, there are a couple of reasons some individuals might choose to avoid it:

1. Cost: Upgrading to a high-quality limited-slip differential can be relatively expensive, and the Auburn Gear 542043 Pro Series LSD is no exception. Some budget-conscious vehicle owners may find this upgrade cost-prohibitive, especially if they have other pressing maintenance or modification needs.
2. Specialized Installation:  Installing a limited-slip differential can be a complex process that requires technical expertise. If you’re uncomfortable performing the installation yourself, hiring a professional mechanic can add to the overall cost of the upgrade. This may deter individuals who prefer simpler DIY modifications or need access to qualified mechanics.

Ultimately, the decision to avoid the Auburn Gear 542043 Pro Series Limited-Slip Differential will depend on individual budget constraints and mechanical skill levels. While it offers many benefits, these potential drawbacks may influence some to seek alternative solutions or modifications for their vehicles.

2- Yukon YDGF9-31-AG Duragrip Differential for Ford 9″

The Yukon YDGF9-31-AG Duragrip Differential is a specialized component designed to enhance the performance and traction of vehicles equipped with Ford 9-inch rear axles featuring 31 spline shafts.

This differential aims to improve stability and control by ensuring that power is evenly distributed between both drive wheels, reducing the occurrence of wheel spin. Its design incorporates a smooth clutch-style mechanism, which enables consistent and predictable torque transfer. This predictability enhances the driving experience, especially in challenging or high-performance scenarios.

Additionally, the Yukon Duragrip Differential is known for its durability, built to withstand the demands of high-torque applications, ensuring long-lasting and reliable performance. Furthermore, it is engineered as a direct-fit replacement, simplifying the installation process for those seeking to upgrade their vehicles confidently.

The Yukon YDGF9-31-AG is designed as a direct-fit replacement for Ford 9″ rear axles with 31 spline shafts, ensuring a hassle-free installation process for those who want to upgrade their vehicles.

In summary, the Yukon YDGF9-31-AG Duragrip Differential is a favored choice among enthusiasts and drivers seeking improved traction, control, and durability for their Ford 9-inch rear axles. Whether you’re exploring off-road trails or pushing the limits on the strip, this differential provides the performance enhancements needed to elevate your driving experience.

Why We Love It:

There are several compelling reasons to appreciate and choose the Yukon YDGF9-31-AG Duragrip Differential for Ford 9″ axles with 31 spline shafts:

1. Smooth Operation: This differential features a clutch-style mechanism that ensures smooth and consistent torque transfer between the drive wheels. The result is predictable and reliable performance, whether you’re accelerating rapidly or navigating challenging terrains. This smooth operation enhances the overall driving experience.
2. Enhanced Traction: This differential significantly improves traction by distributing power evenly to both drive wheels, minimizing wheel spin. This feature is especially valuable for off-road adventures, slippery road conditions, or high-performance driving, as it enhances stability and control.
3. High-Quality Construction: Yukon is renowned for producing robust and durable components, and the Duragrip Differential is no exception. It is engineered to handle high torque demands, ensuring long-lasting performance and peace of mind for drivers who demand durability from their vehicles.
4. Direct Fit: This differential is designed as a direct-fit replacement for Ford 9″ rear axles with 31 spline shafts, simplifying the installation process. You can upgrade your vehicle without requiring extensive modifications, reducing installation time and potential complications.
5. Versatility: The Yukon Duragrip Differential caters to a broad range of driving needs. Whether you’re an off-road enthusiast, a high-performance driver, or seeking improved traction and control in various conditions, this differential offers versatility and adaptability.

What You Should Know:

While the Yukon YDGF9-31-AG Duragrip Differential offers several benefits, there are some reasons some individuals might choose to avoid it:

1. Complex Installation: Installing a limited-slip differential, including the Yukon Duragrip, can be a complex process that requires technical expertise and the right tools. The installation process can be challenging if you don’t have the necessary mechanical skills or access to a qualified mechanic. Some vehicle owners may prefer simpler modifications or upgrades to install themselves.

It’s essential to consider your budget and mechanical abilities when deciding whether to invest in the Yukon YDGF9-31-AG Duragrip Differential. While it offers numerous advantages, these potential drawbacks may influence some individuals to explore alternative solutions for improving their vehicle’s performance and traction.

3- Yukon Gear & Axle 31-Spline Trac-Loc for Ford 9 Differential

The Yukon Gear & Axle 31-Spline Trac-Loc Differential is a versatile and dependable upgrade designed to enhance the performance of 9-inch Ford rear axles with 31-spline shafts. This limited-slip differential offers improved traction and control, making it an excellent choice for a wide range of driving scenarios.

One of its notable features is composite clutches, which contribute to smoother and more predictable torque transfer between the drive wheels. This design ensures that power is evenly distributed, reducing the risk of wheel spin and improving vehicle stability, whether off-roading or engaged in high-performance driving.

Another advantage of this Trac-Loc Differential is its compatibility with all gear ratios, allowing flexibility in choosing the ideal setup for your vehicle. Its 4-pinion design enhances its durability and reliability, enabling it to handle high-torque demands.

Furthermore, the Yukon Gear & Axle Trac-Loc Differential is fully rebuildable, ensuring longevity and peak performance over time. Plus, it’s proudly assembled in the USA, adhering to high-quality standards and manufacturing practices.

This best limited slip differential offers enhanced traction, smooth operation, durability, and compatibility with various gear ratios. Whether you’re tackling challenging terrains or seeking improved control on the racetrack, the Yukon Gear & Axle Trac-Loc Differential is a versatile and dependable choice for optimizing your vehicle’s performance.

Why We Love It:

We love the Yukon Gear & Axle 31-Spline Trac-Loc Differential for several compelling reasons:

1. Compatibility: One of its standout features is its compatibility with all gear ratios, allowing you to tailor your vehicle’s setup to your specific needs and preferences.
2. Rebuildable Design: The fact that it’s fully rebuildable means you can extend its lifespan and maintain its performance over time, making it a cost-effective and sustainable choice.
3. Proudly Assembled in the USA: It is proudly assembled in the USA and reflects a commitment to quality and manufacturing standards.
4. Consistent Performance: The Trac-Loc Differential sets itself apart by employing composite clutches that guarantee a seamless and consistent torque transfer between the drive wheels. This engineering marvel ensures a driving experience of precision and predictability, particularly during acceleration and maneuvering through turns.
5. Unwavering Durability: Yukon Gear & Axle has earned its reputation for crafting robust and long-lasting components, and the Trac-Loc Differential upholds this legacy. Engineered to endure the rigors of high-torque applications and challenging conditions, it offers extended durability and provides peace of mind, knowing that it can withstand the harshest driving conditions.

What You Should Know:

While the Yukon Gear & Axle 31-Spline Trac-Loc Differential offers numerous benefits, there are a few reasons why some individuals might consider avoiding it:

1. Specific Vehicle Compatibility: This differential is designed for Ford 9-inch axles with 31-spline shafts. If your vehicle doesn’t meet these specifications, it may not be a suitable option, requiring you to explore alternatives.
2. Costly Investment: Transitioning to a top-tier limited-slip differential can be a substantial financial commitment. The upfront expenses associated with acquiring the differential and potential installation costs, when expert assistance is necessary, can place a considerable burden on those mindful of their budget. Consequently, individuals who prioritize cost-effectiveness in their vehicle upgrades may find this investment less accessible.

When contemplating the Yukon Gear & Axle Trac-Loc Differential, weighing your budget, mechanical skills, and your vehicle’s compatibility is vital. While the differential presents numerous benefits, these possible downsides might lead certain individuals to explore alternative means of improving their vehicle’s traction and control.

4- Eaton 913A586 Detroit Truetrac 9″ 31 Spline Differential for Ford

The Detroit TrueTrac Limited Slip is an advanced differential system that operates without traditional clutches, utilizing a gear-driven mechanism instead. This innovative design ensures smooth power transfer between the slipping and non-slipping wheels, which is particularly beneficial in challenging situations where traction is compromised. The TrueTrac automatically assists when one wheel loses traction, directing power to the wheel with grip and helping you navigate challenging terrain or escape tricky situations.

One of the key advantages of the Detroit TrueTrac is its durability. Unlike clutch-based limited-slip differentials that can wear out over time, TrueTrac’s gear-driven system offers long-lasting and dependable performance.

It’s important to note that the Detroit TrueTrac Limited Slip is designed for use with aftermarket 35-spline axles and is compatible with gear ratios of 3.25:1 and higher. It requires an aftermarket case with a 3.250-inch bore and is suitable for rear axle applications only, specifically the Ford 9-inch axle with 31 splines.

The Detroit TrueTrac Limited Slip is an advanced, clutch less differential system designed to enhance traction and control by automatically directing power to the wheel with a grip. Its gear-driven mechanism ensures durability and is suitable for specific aftermarket axle configurations and gear ratios, making it a valuable option for off-road and high-performance applications.

Why We Love It:

We love the Detroit TrueTrac Limited Slip for several compelling reasons:

1. Clutch less Design: The TrueTrac operates without traditional clutches, utilizing a gear-driven mechanism. This design eliminates clutch maintenance and ensures long-lasting and dependable performance.
2. Enhanced Traction: This limited-slip differential automatically transfers power from the slipping wheel to the non-slipping wheel, improving traction and control, especially in challenging conditions. It helps you confidently navigate rough terrain and tricky situations.
3. Durability: With no clutches to wear out, the Detroit TrueTrac is built to last. It can withstand the rigors of off-road adventures and high-performance driving, offering consistent performance.
4. Compatibility: It is designed for use with aftermarket 35-spline axles and is suitable for gear ratios of 3.25:1 and higher. This compatibility ensures that it can cater to various off-road and performance applications.
5. Dependability: The TrueTrac Limited Slip is a reliable choice for those who require consistent and effective traction control. Its gear-driven system ensures that it will perform when you need it most.

What You Should Know:

While the Detroit TrueTrac Limited Slip offers several advantages, there are a few reasons some individuals might consider avoiding it:

1. Compatibility Limitations: This limited-slip differential is specifically designed for use with aftermarket 35-spline axles and requires gear ratios of 3.25:1 and higher. If your vehicle doesn’t meet these specifications, the TrueTrac may not be a suitable option, limiting its applicability.
2. Aftermarket Case Requirement: To install the Detroit TrueTrac, you’ll need an aftermarket case with a 3.250-inch bore. This requirement may necessitate additional modifications or expenses, making it less accessible for some vehicle owners.
3. Rear Axle Only: The TrueTrac Limited Slip is only intended for rear axle applications. If you’re looking for a solution to enhance traction in your vehicle’s front axle or other parts, this differential won’t address those needs.

It’s essential to carefully consider your vehicle’s compatibility, installation constraints, and mechanical skills when determining whether the Detroit TrueTrac Limited Slip is suitable for your requirements. While it undoubtedly offers valuable advantages, these possible downsides could prompt some individuals to investigate alternative options for improving their vehicle’s traction and control.

5- Power Trax Ford 9 Inch 35 Spline Grip PRO Traction System

The POWERTRAX Grip Pro represents an advanced innovation in differential technology designed to enhance traction and control in various driving conditions. It combines the best features of a limited-slip differential with the strength of a fully machined, forged steel case. The key to its performance lies in using 3×2 spiral gear technology, allowing for progressive and variable traction based on throttle input.

This means that the driver has the ability to control how much traction is applied, offering finesse when needed and robust traction when necessary. It’s a versatile solution suitable for a wide range of scenarios, from everyday road driving to challenging conditions like rain, snow, and track performance.

The POWERTRAX Grip Pro comes fully assembled and doesn’t require friction plates or friction modifier additives. Instead, it is recommended to use 80W-90 weight petroleum-based gear oil with a GL-5 (or higher) rating. It’s important to avoid synthetic oils and oils containing friction modifiers for optimal performance.

Overall, POWERTRAX TRACTION SYSTEMS, including the Grip Pro, are highly versatile and suitable for light trucks, sport utility vehicles, and muscle cars. Whether you need improved safety for daily driving, enhanced performance for recreational activities, or better traction for work purposes, POWERTRAX offers a comprehensive solution to meet your specific needs and enhance your vehicle’s performance and control.

Why We Love It:

We have a deep appreciation for the POWERTRAX Grip Pro, and here’s why we love it:

1. Advanced Traction Technology: The Grip Pro represents the cutting edge in traction-enhancing differential technology. Its 3×2 spiral gear technology allows for progressive and variable traction based on throttle input, giving drivers precise control over their vehicle’s traction in various conditions.
2. Smooth Operation: This limited-slip differential provides the smooth operation typically associated with such systems. It delivers the traction you need without the harshness or unpredictability often found in other traction-enhancing mechanisms.
3. Durability and Strength: Its fully machined, forged steel case can withstand challenging driving conditions and high torque demands, making it a reliable choice for daily commuting and recreational off-roading.
4. Versatility: The Grip Pro’s ability to adapt to different driving scenarios, from everyday road conditions to rain, snow, and even track performance, makes it a versatile solution suitable for various vehicles and driving preferences.
5. No Friction Modifier Needed: The fact that it doesn’t require friction modifier additives simplifies maintenance and usage. It’s easy to maintain and operate, adding to its appeal.

What You Should Know:

While the POWERTRAX Grip Pro offers impressive features and benefits, there are a few reasons why some individuals might consider avoiding it:

1. Complexity: While advantageous for many, the variable traction control system may be seen as complex by some drivers. Those who prefer a simpler, fully automatic limited-slip differential without user-controlled adjustments might find it less appealing.
2. Compatibility: The Grip Pro is designed for specific applications like any specialized automotive component. It may only be compatible with vehicle makes and models, potentially limiting its usability for some drivers.
3. Cost: High-quality traction-enhancing differentials can be relatively expensive. The initial investment in the Grip Pro and installation costs might deter budget-conscious vehicle owners.
4. Maintenance Considerations: While the Grip Pro doesn’t require friction modifier additives, it still demands regular maintenance to ensure longevity and performance. Some drivers may prefer lower-maintenance traction solutions.

It’s essential to weigh these considerations against the benefits of the POWERTRAX Grip Pro to determine if it aligns with your driving needs and preferences. While it offers advanced traction control, its complexity, compatibility, cost, maintenance, and installation requirements may influence some individuals to explore alternative traction-enhancing options.

What different types of limited slip differential are there?

There are several different types of limited-slip differentials (LSDs), each designed to achieve similar goals but through various mechanisms. Here are some common types:

1.    Open differential

Open differentials in standard non-performance cars prioritize comfort but pose a problem for traction. When one wheel loses grip, the other follows suit, resulting in overall traction loss. This issue becomes critical for performance-oriented driving, especially as power levels increase. Open diffs contribute to the misconception that front-wheel-drive (FWD) cars are ineffective beyond 250 brake horsepower (bhp).

Without a limited-slip differential (LSD), high-powered vehicles struggle to put down their considerable power effectively. LSDs address this challenge by distributing power evenly to both wheels, enhancing traction, and enabling high-powered cars to perform optimally without sacrificing grip.

2.    Torsen limited slip differential

The emergence of this differential type has gained significant recognition in the tuning world, largely thanks to Quaife’s ATB (Automatic Torque Biasing) differential, notably featured in the Focus RS Mk3 and various tuned performance vehicles. While it’s most renowned in these applications, Torsen differentials have graced numerous cars, including many rear-wheel-drive (RWD) Toyotas from the ’90s to the present, Honda’s S2000 and Civic Type R, the S15 Silvia, select ’90s Rover Turbos, and more.

This complex gear-driven setup operates in a manner somewhat opposite to an open differential. A Torsen differential directs power to the wheel with the most traction rather than the least. This, coupled with its robust and road-friendly characteristics, makes it an appealing choice. However, it has a caveat: both wheels must remain in contact with the ground at all times for it to function optimally.

On public roads, this limitation seldom poses issues, rendering Torsen differentials popular for high-performance street cars. Yet, when pushing the limits on a track or engaging in drifting, this requirement can become problematic. While Torsen ATB differentials excel on fast road cars, they are less suitable for drifting due to their unique operation. For fast road driving, they remain a top choice by a significant margin.

3.    Locked/welded/spool differentials

While basic and not ideal for everyday road use, a locked or welded differential and a spool offer significant advantages in various performance applications. Budget-conscious drifters and drag racers often opt for a welded diff, nullifying the differential function by welding its gears together, causing both outputs to rotate continuously at the same speed. This enhances traction and control but can lead to handling drawbacks, such as increased understeer in regular driving and heightened oversteer in RWD cars when pushed beyond traction limits.

Another downside is noticeable wheel shuffle and shuddering when negotiating corners at very low speeds. Despite these limitations, some race cars, including those from renowned manufacturers like Cosworth, Porsche, and Subaru, have embraced a similar concept known as a spool. The spool replaces the differential internals with a single solid unit that consistently provides equal drive to both wheels.

While not the ideal setup in theory, spools have been employed in numerous high-level competition vehicles, achieving remarkable success in motorsports. This demonstrates that, under specific circumstances, the advantages of a locked or spooled differential can outweigh their inherent handling challenges.

4.    Viscous limited slip differential

The majority of factory-installed LSDs in production vehicles are viscous units. These LSDs regulate slip by utilizing a viscous fluid enclosed within a sealed housing, creating resistance akin to walking through thick mud or quicksand. While the outputs can move independently to some extent, the viscous fluid makes it more challenging for one wheel to slip freely. The faster you attempt to move through it, the less it permits slip, achieving the desired effect.

However, viscous LSDs have notable drawbacks. Many standard units allow a significant amount of slip, which may suit daily drivers but needs more performance advantages seen in aftermarket differentials. Additionally, these LSDs tend to lose effectiveness over time and with exposure to heat. In older cars, their viscous diffs often deteriorate to a point where they offer little improvement over an open differential. While it’s possible to create a performance version of a viscous diff, there are better solutions than this, and as a result, such units are relatively rare.

5.    Plated limited slip differential

Plated LSDs are the top choice for motorsport applications, including drifting, drag racing, and track days. However, they are generally less suited for everyday road use compared to Torsen units. Like other LSD types, their locking behavior can be adjusted to match specific needs. Some vehicles, notably BMWs, come equipped with plated LSDs as standard, although they typically have lower lock settings compared to aftermarket options.

Plated LSDs function by using friction plates to limit slip, similar to how a clutch operates. Just like performance clutches, a heavily upgraded plated LSD can exhibit harsh behavior, locking quickly and causing the car to feel jittery at low speeds. It also makes the car more challenging to control during hard acceleration, as power is transmitted immediately without slip. However, like clutches, plated differentials can wear out over time, particularly with aggressive use and high-power levels. Fortunately, many popular models can be easily rebuilt. Despite these considerations, plated LSDs remain the LSD of choice for high-performance, hard-driven cars.

The best limited slip differential choice depends on the vehicle’s intended use, the manufacturer’s preference, and the desired balance between traction and handling characteristics. Each type has advantages and disadvantages, making it crucial to select the right LSD for specific driving needs.

A Final Thought

In conclusion, the Ford 9-inch limited slip differential is a versatile and highly regarded choice for enhancing traction and control in various automotive applications. Its robust design, adjustability, and compatibility with a wide range of vehicles have earned its reputation as a top-performing differential in motorsports and everyday driving. Whether you’re a racing enthusiast seeking better performance on the track or a streetcar owner looking for improved stability and traction, the Ford 9-inch limited slip differential offers a reliable solution. Its ability to efficiently distribute power between the wheels and its adaptability to different setups make it a standout choice for those seeking superior handling and traction performance.