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

A mini spool replaces the differential gears in an open carrier to lock both axles together. This ensures 100% of the engine's power goes to both wheels simultaneously, providing maximum traction for applications like drag racing or off-roading.

Is this spool compatible with all gear ratios?

No, this specific Yukon Gear spool is designed for use only with 4.10 and numerically lower gear ratios in the GM 12-bolt rear end.

What are the implications of using a spool on a street-driven vehicle?

Spools lock both wheels together constantly, which can cause tire scrubbing and make turning more difficult on pavement. They are generally not recommended for daily drivers due to these characteristics and potential wear on tires and drivetrain components.

Yukon Gear Steel Spool For GM 12 Bolt Car w/ 30 Spline Axles / 4.10+

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Specifications

Brand: Yukon Gear & Axle
Part #: YP FSGM12P-4-30
UPC: 883584321873

Yukon Gear Steel Spool For GM 12 Bolt Car w/ 30 Spline Axles / 4.10+

Name: Yukon Gear Steel Spool For GM 12 Bolt Car w/ 30 Spline Axles / 4.10+
Brand: Yukon Gear & Axle
Price: 437.89 USD
Availability: InStock

$437.89

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Yukon Gear Steel Spool for GM 12 Bolt Car w/ 30 Spline Axles / 4.10+. Provides 100% traction to both wheels.

Key Features

Fits GM 12 Bolt passenger car rear ends with 30 spline axles and 4.10 and up gear ratios.
Provides 100% traction to both wheels at all times for maximum grip.
Made from high-quality steel for strength and long life in performance applications.
Designed to install into a standard open differential carrier.
Not recommended for street-driven vehicles due to its full-time locked nature.

⚠️ 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

If you're looking to get the most traction out of your GM 12-bolt rear end, especially for drag racing or off-road use, a spool is a solid choice. This Yukon Gear steel spool is designed to replace the differential gears in a standard open carrier, forcing 100% of the engine's power to be sent to both rear wheels at all times. This ensures maximum grip when you need it most, whether you're launching off the line or navigating challenging terrain.

This spool is built from high-quality steel for strength and longevity in performance applications. It's specifically made for GM 12-bolt passenger car rear ends that use 30-spline axles and are set up with a 4.10 or numerically lower gear ratio. Because it locks both wheels together, it's not recommended for daily driving on paved roads, as it can cause tire scrub and make turning more difficult. It's a popular upgrade for vehicles like the Chevrolet Chevelle, Camaro, and Pontiac Firebird when maximum traction is the priority.