What is a spool differential and why would I use one?

A spool differential locks both rear wheels together, forcing them to rotate at the same speed. This ensures 100% traction to both wheels, which is beneficial for dedicated off-road use or drag racing where maximum grip is needed. It's not recommended for street use due to how it affects turning.

What does 'small bearing journal' mean for this spool?

The 'small bearing journal' refers to the diameter of the housing where the differential bearings sit. This specific spool is designed to fit Ford 9-inch differential cases that have a smaller bearing journal size, specifically 2.968 inches and 3.062 inches.

What vehicles does this Yukon spool fit?

This spool is designed for Ford 9-inch rear ends with 35-spline axles and small bearing cases. It fits a wide range of classic Ford vehicles, including many Bronco, E-Series Econoline, F-Series trucks, Fairlane, Falcon, Galaxie, Gran Torino, Granada, LTD, Maverick, and Mustang models.

Yukon Gear Steel Spool For Ford 9in w/ 35 Spline Axles / Small Bearing

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Specifications

Brand: Yukon Gear & Axle
Part #: YP FSF9-35SMALL
UPC: 883584320982

Yukon Gear Steel Spool For Ford 9in w/ 35 Spline Axles / Small Bearing

Name: Yukon Gear Steel Spool For Ford 9in w/ 35 Spline Axles / Small Bearing
Brand: Yukon Gear & Axle
Price: 506.89 USD
Availability: InStock

$506.89

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Yukon Gear Steel Spool for Ford 9in w/ 35 Spline Axles / Small Bearing. Provides 100% traction to both wheels.

Key Features

Fits Ford 9in rearends with 35 spline axles and small bearing journals.
Provides 100% traction to both wheels at all times.
Small bearing journal fits 2.968" and 3.062" differential dropouts.
Constructed from heat-treated 8620 steel for added strength.
Installs in place of the original differential carrier assembly.
Not recommended for street-driven vehicles.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

This Yukon Gear & Axle spool is a direct replacement for your differential carrier assembly in Ford 9-inch rearends with 35-spline axles and small bearing journals. It's designed to give you 100% traction to both rear wheels at all times, making it a popular choice for dedicated off-road vehicles and drag racing applications where maximum grip is essential. This spool fits a wide range of classic Ford vehicles, including models like the Ford Bronco, F-100, and Mustang from various years.

Crafted from high-quality 8620 steel, each spool is heat-treated to enhance its strength and durability for demanding performance use. The small bearing journal design is specifically made to fit differential cases with 2.968-inch and 3.062-inch dropouts. Because it locks both wheels together, it's important to note that this type of differential is not recommended for street-driven vehicles due to potential tire scrub and handling changes during turns.

When you're building a serious off-road rig or a dedicated drag car, a spool like this is a cost-effective way to ensure you get full power to the ground. It's a solid option for anyone looking to maximize their vehicle's traction in specialized applications.