F9-4.11-28POSI FORD 9 Center Member Spline Posi

Review FORD 9 Inch Section 3rd Member Spline Posi 4.11 Ratio 411

Introducing the Ford F9-4.11-28POSi center 3rd member, a crucial component in the drivetrain system of your Ford vehicle. This 4.11 ring and pinion assembly is designed specifically for applications requiring a 28 spline Posi (Positive Lock) output shaft.

The F9-4.11-28POSi is a robust and reliable unit, engineered to deliver optimal power transfer between the differential and the driveshaft. The Posi (Positive Lock) feature ensures that the driveshaft stays securely engaged with the differential, reducing power loss and providing improved traction and performance.

This 4.11 gear ratio is an excellent choice for those seeking a balance between low-end torque and top-end power. With a 4.11 ratio, your vehicle will have a stronger launch and improved acceleration, making it an ideal choice for towing or hauling heavy loads.

The Ford F9-4.11-28POSi 3rd member is precision-machined from high-strength steel, ensuring durability and longevity. The gears are manufactured using advanced heat-treating processes to ensure strength and longevity. The pinion and ring gear teeth are precision-cut using state-of-the-art gear cutting technology, providing superior tooth engagement and quiet operation.

This assembly comes fully sealed, protecting the internal components from contaminants and ensuring a long service life. The seals are designed to withstand the high temperatures and pressures generated during operation, providing peace of mind and reducing the need for frequent maintenance.

The Ford F9-4.11-28POSi center 3rd member is a direct factory replacement, ensuring a perfect fit and easy installation. It is engineered to meet or exceed OEM specifications, providing you with the confidence and reliability you expect from a genuine Ford part.

In conclusion, the Ford F9-4.11-28POSi center 3rd member is a high-performance, durable, and reliable component designed to deliver optimal power transfer and improved traction in your Ford vehicle. With its robust construction, advanced engineering, and precision manufacturing, this assembly is an excellent choice for those seeking superior performance and longevity from their drivetrain system.

The Ford 9-inch third member with a 4.11 ratio and 28-spline Posi differential (part number 411) is a popular choice among Ford enthusiasts for its durability and performance. Here are some pros and cons of buying this third member:

1. Durability: The 9-inch third member is known for its strength and durability. It can handle high horsepower and torque, making it a popular choice for high-performance applications.

2. Versatility: The 4.11 ratio is a common gear ratio for street use. It provides a good balance between acceleration and fuel economy. The Posi differential provides better traction and reduces wheel hop, making it ideal for street and strip applications.

3. Availability: The Ford 9-inch third member is widely available from various aftermarket suppliers. This makes it easy to find and purchase the necessary parts for installation.

4. Upgradeability: The 9-inch third member can be easily upgraded with various aftermarket components, such as different gear ratios, lockers, and brakes.

1. Cost: The Ford 9-inch third member can be quite expensive, especially when compared to other differential options. The cost of the third member, as well as the cost of any necessary upgrades, can add up quickly.

2. Complexity: Installing a 9-inch third member can be a complex and time-consuming process. It requires specialized tools and skills, as well as a significant amount of time and effort.

3. Weight: The 9-inch third member is heavier than some other differential options, which can impact the vehicle's performance and fuel economy.

In conclusion, the Ford 9-inch third member with a 4.11 ratio and 28-spline Posi differential is a high-performance and durable option for those looking to upgrade their Ford vehicle. However, it comes with a higher cost, complexity, and weight compared to other differential options. Ultimately, the decision to purchase this third member depends on your specific needs, budget, and technical capabilities. If you have the resources and are looking for a high-performance differential for your Ford vehicle, then the Ford 9-inch third member with a 4.11 ratio and 28-spline Posi differential is a worthy investment. If you're on a tighter budget or prefer a simpler installation process, then you may want to consider other differential options.

Details:

28 spline billet posi unit. Priced to sell. Build specs: - single ribbed case. It was removed as the customer wanted to go a different gear ratio.

As you can see in the pictures, it does not have very many miles on. 4.10/4.11 ratio gears. 1310 short narrow yoke 3-1/4 x 1-1/16 u-joint. Tim ken bearings.

Heavily discounted. Solid spacer - no crush sleeve. This unit is in great shape and ready to be installed your vehicle.

specifications differentialsdepo:

• for years: 2028
• brand: Ford 9
• mpn: F9-4.11-28posi
• type: Third Member
• oe/oem part number: F9-411, F9-410-28posi
• items included: Center Section
• gear ratio: 4.11
• id: Eb0217
• bore diameter: 9 In
• placement on vehicle: Rear

general differentialsdepo:

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

returns differentialsdepo:

• policy: no returns

offer differentialsdepo:

• availability: in stock
• in stock #: 3
• best offers: true
• started: october 28, 2025
• sold #: 20
• prices: $550.00–$1095.00
• item condition: Used
• options: ship-to-home

shipping differentialsdepo:

• transit: 3-7 days
• type: fixed
• service: ups ground
• class: standard
• carrier: ups

payments differentialsdepo:

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

seller differentialsdepo:

• city: hiawatha, iowa
• # reviews: 1791
• rating: 100.0%