AUT178915S120 AUT Spline Posi Axle Differential Locker F8 Sl

Review AUT Fit For Ford 8.8 Inch 10 Bolt-31 Spline Posi Axle Differential Locker for FORD F8 SL

Introducing the AUTOART 178915S120 Posi Axle Differential Locker for Ford 8.8-inch 10-bolt 31-spline rear axles. This high-performance differential locker is designed specifically for Ford vehicles with the F8.8-31 axle configuration.

The AUTOART Posi Axle Differential Locker is an essential upgrade for off-road enthusiasts and high-performance driving enthusiasts. It utilizes a robust, 100% forged steel construction that provides superior strength and durability compared to factory differential components. This locker is designed to prevent wheel slippage during power transfer, delivering maximum traction and enhanced vehicle stability.

The AUTOART Posi Axle Differential Locker features a spider and ring gear design with 31 splines. This design allows for smooth engagement and efficient power transfer, resulting in improved acceleration and overall vehicle performance. The locker also comes with a gear ratio of 4.10:1, making it an excellent choice for off-road applications where low-end torque is crucial.

One of the standout features of the AUTOART Posi Axle Differential Locker is its adjustable locking mechanism. This feature allows users to fine-tune the locker's engagement point, providing added versatility and customization based on driving conditions. The locker also comes with a built-in detent mechanism that ensures positive engagement, preventing unwanted disengagement during high-stress situations.

Installation of the AUTOART Posi Axle Differential Locker is made easy with included hardware and detailed instructions. It is designed to be a direct replacement for the factory differential, making it a straightforward upgrade for Ford 8.8-inch 10-bolt 31-spline rear axles.

In summary, the AUTOART 178915S120 Posi Axle Differential Locker is an excellent upgrade for Ford 8.8-inch 10-bolt 31-spline rear axles. Its robust construction, adjustable locking mechanism, and smooth engagement design make it a top choice for off-road enthusiasts and performance driving enthusiasts alike. With improved traction, enhanced stability, and efficient power transfer, this locker is sure to take your Ford vehicle to the next level.

The Autoclarion AUT178915S120 is a 31-spline posi axle differential locker designed for Ford 8.8-inch 10-bolt rear ends. Here are some pros and cons that might help you make an informed decision about whether or not to purchase this product.

1. Improved Traction: By locking the differential, power is evenly distributed to both wheels during turns, providing better traction and improved stability.

2. Enhanced Off-Road Performance: The locker is particularly useful in off-road conditions where one wheel may spin due to a lack of traction.

3. Durable Construction: The AUT178915S120 is made from high-strength materials and is designed to withstand the rigors of off-road use.

4. Easy Installation: The locker can be installed on most Ford 8.8-inch 10-bolt rear ends without the need for extensive modifications.

5. Affordable: Compared to other locking differentials, the AUT178915S120 is relatively affordable.

1. Reduced Flexibility: With the differential locked, there is no differential action, which can make the vehicle less maneuverable in certain situations.

2. Increased Wear and Tear: The constant engagement of the locker can lead to increased wear and tear on the differential gears and other components.

3. No Automatic Engagement: The locker must be manually engaged and disengaged, which can be a hassle in some situations.

4. Not Suitable for High-Speed Driving: The locker is best suited for low-speed off-road applications and is not recommended for high-speed driving.

In conclusion, the AUT178915S120 is a great option for those looking for improved traction and off-road performance. However, it comes with some drawbacks such as reduced flexibility and increased wear and tear. Ultimately, the decision to purchase this product depends on your specific needs and driving conditions. If you frequently find yourself in off-road situations where traction is a concern, then the benefits of this locker may outweigh the drawbacks. If you primarily drive on the road and value flexibility and smooth operation, then you may want to consider other options.

Based on the information provided, my recommendation would be for off-road enthusiasts who prioritize improved traction and are looking for an affordable solution. However, those who value flexibility and smooth operation may want to consider other options or consult a professional for further advice.

Details:

Effect:the operation of differential locker is fully Automatic. Ford 8.8 - 31 spline 8.8, '11-'14 f150 only spline compatible make / model. The internal gears on the locker will override each other to allow this distinction. Fit for Ford 8.8 -10 bolt-31 spline - posi axle differential locker Sl F8.8-31 note.

Compatible differentials. Feature: function:when driving in a straight line, the locker will lock axles together, similar to spool. . Fits Ford 8.8 with 31 spline axles and 7/8 cross pin shaft.

However, when the wheels need to be differentiated during a turn, locker will allow outer rotate faster complete turn. Package includes: 1 differential locker. Replaces the spider gears in a standard carrier case - will not fits limited Slip differential. New list item.

specifications differentialsdepo:

• for models: F8, Sl
• for makes: Ford
• brand: Aut
• mpn: Aut178915s120
• manufacturer warranty: 5 Years
• fitment type: Direct Replacement
• shipped country: Us
• custom bundle: No
• bundle description: 1x Axle Differential Locker
• material: Metal
• note1: For Ford 8.8, 11-14 F150 Only 31 Spline
• note2: 30 Days Free Return
• oe/oem part number: Sl F8.8-31, Slf8.8-31, Xd-48831
• specification: For Ford 8.8 31 Spline
• type: Differential Locker
• vintage part: Yes

seller differentialsdepo:

• city: ontario, california
• # reviews: 11529
• rating: 99.4%

general differentialsdepo:

• category: Auto Parts > Transmission Drivetrain > Differentials, Assemblies > Additional

offer differentialsdepo:

• started: december 18, 2025
• options: ship-to-home
• availability: in stock
• in stock #: 1
• price: $130.99
• item condition: New
• sold #: 17
• best offers: true

shipping differentialsdepo:

• class: standard
• service: standard
• transit: 4-8 days
• type: fixed

payments differentialsdepo:

• other
• wallet: google-pay
• credit card: mastercard

returns differentialsdepo:

• policy: returns accepted
• time: 30 days
• paid by: seller