Hays 85-103 Clutch Kit, Street/Strip, GM, 10.5 Inch Diameter

The Hays 85-103 is a 10.5-inch street/strip clutch kit for GM applications, sold as a matched assembly rather than a collection of separate parts. It pairs a diaphragm-style pressure plate with an organic, sprung-hub disc sized for a 10-spline, 1-1/8-inch input shaft, and suits Buick, Chevy, and Pontiac drivetrains that use that spline count.

What the diaphragm design offers

A diaphragm pressure plate keeps pedal effort light while still giving a clean, positive release, which matters when gear changes happen quickly under load. The cover on this kit is built heavy to resist flex, so clamping force stays steady instead of fading as the clutch heats up during repeated runs. An organic sprung-hub disc also softens engagement shock compared with a rigid-hub design, which helps protect the rest of the drivetrain.

Fitment to check before ordering

Make sure your flywheel and bellhousing are machined for a 10.5-inch clutch before placing an order, since this kit is sized specifically to that diameter. Because the parts are sold as one matched set, mixing its disc or pressure plate with components from another kit can throw off pedal feel and release timing.

What is included

The kit ships complete with the throw-out bearing and a clutch alignment tool, so there is no need to source those pieces separately for a straightforward swap. More GM clutch and transmission parts are available for drivers building out the rest of the driveline around this kit.

Will this fit any GM car with a 10-spline transmission? It is sized around a 10.5-inch clutch and a 10-spline shaft, used across Buick, Chevy, and Pontiac applications, but the shaft spline count is what matters, not the model badge.