Billet Direct Drum
The UT drum is ported for direct clutch oil feed (third gear). The OEM drum uses a biscuit cut for oil feed. The ports increase hydraulic flow and reduce fluid turbulence caused by the less expensive biscuit cut. This drum design uses three ports to match the volume for the larger piston. Their drum is also designed to withstand up to 20,000 rpm. OEM drums will grenade (literally) at 10,000 rpm. This is possible when low one-way clutch assembly (keeps the drum from spinning backward) fails. This failure is becoming more common with drag racing or sled pulling and higher rpms being reached. With the one-way clutch failure the drum speed exceeds engine rpms. UT drums are billet, made from a modified alloy to increase strength and eliminate a potential hazard.