91049348-389 SPEEDWAY MOTORS Member Spline Lite Spool Ford

Review SPEEDWAY MOTORS Fits Ford Inch 3rd Member Assembly 35 Spline Lite Spool 3.89 Ratio for FORD

The Speedway Motors 91049348-389 Ford 3rd Member 35 Spline Lite Spool with a gear ratio of 3.89 is a high-performance differential assembly designed to enhance the power transfer and handling capabilities of your Ford vehicle. This differential is engineered to fit Ford applications that use a 35 spline output and a 3rd member with a 28.5 spline ring gear.

The lite spool design of this differential ensures minimal power loss during power transitions, providing exceptional traction and acceleration. This is achieved through the use of a lightweight, yet robust spool design that eliminates the need for a clutch pack and viscous coupling, which can add unnecessary weight and parasitic loss.

The 35 spline input and output shafts are precision machined from robust materials to ensure maximum strength and durability. The shafts are also treated with a special coating to protect against wear and corrosion. The 3rd member housing is also made from high-strength materials to provide a solid foundation for the differential components.

The 3.89 gear ratio offers an excellent balance between power and RPM, making it a popular choice for street performance and racing applications. The gears are precision cut and heat-treated to ensure optimal tooth engagement and longevity. The pinion and ring gear are also hardened to resist wear and to provide maximum durability.

This differential assembly comes with all the necessary seals and bearings to ensure a proper installation and sealing. The installation process is made easier by the inclusion of detailed instructions, as well as technical support from Speedway Motors if needed.

In summary, the Speedway Motors 91049348-389 Ford 3rd Member 35 Spline Lite Spool with a gear ratio of 3.89 is a high-performance differential assembly designed to provide exceptional power transfer and handling capabilities for Ford applications. Its lite spool design minimizes power loss, while its precision-machined components ensure maximum strength and durability. With detailed instructions and technical support, this differential is an excellent choice for those looking to enhance their Ford vehicle's performance.

Pros and Cons of Buying Speedway 91049348-389 Ford 3rd Member 35 Spline Lite Spool 3.89

The Speedway Motors 91049348-389 Ford 3rd Member 35 Spline Lite Spool 3.89 is a popular aftermarket differential for Ford vehicles. Here are some potential advantages and disadvantages of purchasing this product.

1. Improved Performance: The lite spool design reduces unwanted power loss, resulting in increased torque and horsepower.

2. Durability: This differential is made with heavy-duty materials, including a billet steel spool and case, ensuring long-term durability.

3. Customizability: With various gear ratios available, this differential caters to different driving styles and applications.

4. Affordability: Compared to other aftermarket differentials, this product offers a reasonable price point.

1. Installation Complexity: Installing this differential may require professional assistance or extensive mechanical knowledge.

2. No Lube System: This differential does not come with a factory-sealed lube system, which means the user must manually fill it with the appropriate lubricant.

3. Limited Compatibility: This differential is specifically designed for select Ford models and applications, so it may not be suitable for all users.

The Speedway 91049348-389 Ford 3rd Member 35 Spline Lite Spool 3.89 offers numerous advantages, such as improved performance and durability. However, it comes with some disadvantages, like installation complexity and the lack of a factory-sealed lube system. Considering the customizability and affordability, this differential is an attractive option for Ford enthusiasts looking to enhance their vehicle's performance.

If you are a Ford owner seeking to upgrade your differential for increased performance and durability, the Speedway Motors 91049348-389 Ford 3rd Member 35 Spline Lite Spool 3.89 is a solid choice. Ensure you have the necessary mechanical knowledge or professional assistance for installation and understanding of manual lubrication requirements.

Details:

Yes, I recommend this product. Correct backlash, reload, and pinion shimming to ensure optimal gear pattern. The brute strength of a properly built 9-inch with premium performance internals can take substantial amounts power and easily transfer it to the track surface through slicks or drag radials. Solid pinion spacer and shim setup maintains depth versus traditional crush sleeve.

Ring and pinion gears use long-wearing 8620 cold-rolled steel. Lots of down shifting and never had an issue. We mud race on a variety of tracks with cut tractor tires. This high temperature seal helps eliminate pinion leaks, reduces maintenance, and keeps the third member properly lubricated.

The oem crush sleeve can allow ring and pinion gear pattern changes under hard use by allowing to the depth reload because washer crushes further these heavy loads. Lightened gear options available call to inquire. To that end our ring and pinion gears of choice are the Richmond excel gear sets. Lightweight forged chorally steel full size spool for maximum traction.

Nodular iron housing is stronger than oem gray and includes 4 lbs. I'm impressed by the quality of these parts. Very pleased with the service and ready to install it. Includes form fitted, reusable red poly shipping/ storage case.

An assembled Ford 9-inch third member ready for your racing needs: Fords 9-inch is the undisputed king of performance rear axles for most any racing you can imagine, but theres nowhere more popular than in drag. Built of quality, fantastic price and shipping. Headquarters. Vito pinion seal installed, which is resistant to chemicals and high temperatures.

specifications differentialsdepo:

• for makes: Ford
• brand: Speedway Motors
• mpn: 91049348-389
• type: Differential Third Members
• item length: 18.00
• item width: 14.300
• california prop 65 warning: True

general differentialsdepo:

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

shipping differentialsdepo:

• service: ups ground
• carrier: ups
• type: fixed
• class: standard
• transit: 3-8 days

seller differentialsdepo:

• rating: 99.7%
• # reviews: 350646
• city: lincoln, nebraska

returns differentialsdepo:

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

payments differentialsdepo:

• credit card: visa
• other
• wallet: apple-pay

offer differentialsdepo:

• options: ship-to-home
• availability: in stock
• sold #: 14
• prices: $70.99–$129.99
• item condition: New
• started: february 23, 2026
• in stock #: 5