What is a spool and why would I use one?

A spool replaces your differential carrier and locks both rear axles together 100% of the time. This ensures both wheels receive power simultaneously, which is crucial for maximizing traction in off-road or drag racing applications.

Is this spool compatible with different ring gear bolt sizes?

Yes, this Yukon spool is double drilled, meaning it's designed to accept both 7/16-inch and 1/2-inch ring gear bolts, offering flexibility during installation.

What are the downsides of running a spool on a street car?

Spools are not recommended for street-driven vehicles because they lock both wheels together. This can cause tire scrub, increased wear, and make turning more difficult, especially at lower speeds.

Yukon Gear Steel Spool 33 Spline for Ford 9in YP FSF9-33

Name: Yukon Gear Steel Spool For Ford 9in w/ 33 Spline Axles
Brand: Yukon Gear & Axle
Price: 472.89 USD
Availability: InStock

Yukon Gear Steel Spool For Ford 9in w/ 33 Spline Axles

$472.89

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Yukon Gear Steel Spool for Ford 9in w/ 33 Spline Axles. Converts diff to 100% lockup for off-road and racing.

Key Features

Fits Ford 9-inch rearends with 33-spline axles.
Provides 100% traction to both wheels at all times.
Made from heat-treated 8620 steel for added strength.
Double drilled for 7/16-inch and 1/2-inch ring gear bolts.
Designed for dedicated off-road and drag racing vehicles only.
Not recommended for street-driven vehicles.

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Will this fit your vehicle?

Product Details

Yukon Gear & Axle is known for making strong drivetrain components, and this steel spool is a prime example. If you're building a dedicated off-road rig or a drag car, this spool is a cost-effective way to get 100% lockup for your Ford 9-inch rearend. It replaces your differential carrier assembly, sending power to both rear wheels constantly, which is exactly what you need when traction is at a premium.

This spool is made from 8620 steel and heat-treated for extra strength, so it can handle the demands of serious performance applications. It's designed to fit Ford 9-inch rearends with 33-spline axles and is double drilled to accept either 7/16-inch or 1/2-inch ring gear bolts, giving you some flexibility during installation. Keep in mind, this type of 100% locked differential isn't recommended for street-driven vehicles because it can make turning difficult and cause tire scrub.

This spool fits a wide range of classic Ford vehicles, including models like the Ford Bronco, F-100, and Mustang from various years. It's a solid choice for anyone looking to maximize traction in a dedicated performance vehicle.