Ford C6 E4OD 4R100 Transmission Billet Forward Clutch Drum C-6 / E4OD / 4R100 Forward Clutch Drum Made from 4140 heat treated stress relieved billet steel for EXTREME performance applications such as off-road and drag racing applications. Eliminates spline failure and snap ring Blow-Out. Combine this Forward Clutch Drum with Billet Input Shaft Part# 499700 for one of the strongest and most durable 4R100 transmissions "On & Off" the road today.