This clutch kit features a 26 spline, 10.4" Diameter Disc for mating a Tremec TKO-600 transmission to a small block Ford. The pressure plate is a diaphragm style. Centerforce Dual Friction clutches generate up to a 90 percent increase in holding capacity over stock systems. These clutch-and-disc sets are designed for engines producing high horsepower and big torque outputs. Perfect for replica vehicles, all Centerforce clutch systems provide smooth engagement and light pedal pressure, without compromising high performance. Thank goodness for clutch operation improvements that have made classic Mustangs easier to drive and enjoy. There are at least two types of hydraulic clutch conversion kits out there from JMC Motorsports and Wilwood. Cable clutch kits from D.B. Performance Engineering, Ron Morris Performance, and Modern Driveline have also made clutch operation much easier, thank you very much.