Ford C-4 C4 Billet 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. No modifications required.