TH400 Alm Drum Assy Direct w/6-Clutches

The TH400 Aluminum Drum Assembly Direct with 6-Clutches from ATI Performance is a high-gear transmission drum engineered for TH400 builds requiring maximum holding capacity and durability. This aluminum drum assembly replaces the original unit with a lightweight, precision-machined component that maintains OEM compatibility while supporting aggressive transmission tuning and heavy-duty driving conditions.

The six-clutch design increases friction material engagement compared to stock configurations, translating to firmer band engagement and reduced slippage under load. Aluminum construction reduces rotational mass, which improves shift responsiveness and fuel efficiency in street-driven TH400 vehicles. The natural aluminum finish resists corrosion in typical underbody environments while maintaining visual appeal for those upgrading transmission internals as part of a restoration or performance build. Weighing 10.1 lbs, this assembly is direct-fit for TH400 transmissions without requiring adapter plates or additional modifications.

This drum is ideal for builders upgrading transmission internals for high-performance street and strip applications, or those seeking OEM replacement components with enhanced clutch capacity. TH400 transmissions equipped with multi-clutch drums improve holding strength during hard launches and sustained acceleration, preventing drum slip that can damage bearings and supporting gears. Installation requires standard transmission service tools and baseline rebuild knowledge; consult transmission-specific service literature for torque specifications and assembly sequence.

ATI Performance has positioned itself in the aftermarket transmission parts space by offering internally verified components designed for both OEM restoration and performance enhancement. The TH400 drum assembly carries the manufacturer part number 405724 and is supplied as a kit-ready component for immediate installation in compatible transmission builds.