5.5in 1.125in-10spl 2- Disc

The Quarter Master 5.5in 1.125in-10spl 2-Disc clutch disc set is engineered for serious performance enthusiasts and professional mechanics building or upgrading manual transmission systems. This rigid-hub clutch disc pair delivers the direct engagement and repeatable response that high-revving engine builds demand, whether you're assembling a street machine, drag racer, or precision track car. The universal design accommodates a wide range of transmission bell housings, making it an essential component for custom drivetrain configurations where OEM clutches fall short of performance expectations.

With a 5.5-inch diameter friction surface and 1-1/8-inch by 10-spline hub interface, this two-disc clutch system provides increased contact area and superior torque capacity compared to single-disc alternatives. The rigid hub design—as opposed to damped or sprung hubs—eliminates compliance in the drivetrain, ensuring instantaneous power transfer with zero creep during launch. This characteristic makes rigid-hub configurations the go-to choice for synchronized gear engagement in competition vehicles and high-horsepower street applications where smooth, predictable clutch feel is paramount. The matched pair (two discs) optimizes clamping load distribution across the pressure plate, reducing wear and heat generation during aggressive driving or repeated launches.

Technicians favor Quarter Master clutch assemblies for hot rod restorations, engine transplant projects, and forced-induction conversions where original equipment specifications prove inadequate. The 1.125-inch spline size and 10-tooth configuration ensure compatibility with transmission input shafts and bell housing designs commonly found in mid-sized American V8 builds and import performance conversions. Installation requires proper flywheel resurfacing, clutch alignment using a mandrel tool, and pressure plate selection matched to your specific engine output and vehicle weight. Verify spline count and pilot bearing diameter against your transmission documentation before purchase to guarantee seamless integration into your custom driveline.