Ultra Light Alum Spool

The WINTERS Ultra Light Aluminum Spool (model 5034-11UL) is a 10-inch quick-change rear spool assembly engineered for high-performance drag racing and dedicated bracket racing applications. Built from aluminum to minimize unsprung weight, this 31-spline spool reduces rotational inertia while maintaining the structural integrity required for consistent power delivery on the strip.

The 31-spline design provides direct engagement with compatible driveshaft flanges and allows for rapid axle ratio changes without removing the spool from the housing. The quick-change architecture is the industry standard for racers who need to transition between different gearing setups for varying track conditions or racing formats. At 5.16 lbs, the aluminum construction saves significant rotational mass compared to ductile-iron alternatives, improving launch characteristics and reducing tire spin in traction-limited scenarios. This spool integrates seamlessly into 10-inch rear axle housings common in small-block and mid-size drag racing platforms.

This spool is ideal for bracket racers, bracket racing competitors, and drag racing enthusiasts who prioritize weight reduction and quick axle ratio changes. The ultra-light aluminum construction is particularly valuable in weight-regulated bracket racing classes where total vehicle mass directly impacts performance consistency. Racers who frequently test different gear ratios at test-and-tune events or who run multiple racing formats will appreciate the efficiency of the quick-change system, which allows ratio swaps in minutes rather than hours.

WINTERS is recognized in the drag racing community for precision-manufactured differential components. The 10-inch quick-change spool format is a proven standard in American drag racing, used from grassroots bracket racing through competitive NHRA applications. Buyers sourcing WINTERS 10-inch quick-change spools for sale should confirm compatibility with their specific rear axle housing design and verify spline engagement with their driveshaft flange before purchase.