The TCS billet front clutch drum with large size piston is made from medium-carbon machinery steel and is longer lasting than an aluminum drum. It is stronger, more reliable & safer than OE and holds up to 6 friction plates. The TCS billet front clutch drum with large area piston is recommended for racing Dodge diesel applications has 55% more piston apply surface area, resulting in double the clamping force needed in third gear, and comes with a precision CNC machined billet aluminum piston.