TCS Ford C-4 Billet Aluminum Direct Drum C-4 Aluminum Direct Drum Manufactured from 7075-T6 billet aluminum 60% weight reduction, weighs 1.38 lbs. vs 3.40 lbs. on the O.E. part Holds up to 6 frictions Ring bore utilizes a steel ring sleeve Increased piston apply feed holes Uses O.E. support bushings 100% drop-in product. Modifications required would be for the 6 clutch pressure plate to be cut down for proper clearance.