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ATI introduces its new Aluminum Clutch Drum with a steel insert

ATI Aluminum Powerglide Clutch Drum
ATI Aluminum Powerglide Clutch Drum

ATI Performance Products has developed a new steel insert for its Aluminum Clutch Drum for GM Powerglide transmissions. The new steel insert accepts the OEM bushing and will eliminate wear on the inside of the drum of its bushing surface and oil ring diameter to the stator support. These areas were being damaged by lack of lubrication with racers selecting neutral and shutting the engine down in excess of 8000 RPM at the end of the track. When the engine stops turning, the transmission pump does also and cuts off the oil flow to the transmission. The drum accelerates from stop to engine RPM on the first to second gear change. Clutch life is extended with the aluminum being 1/3 the weight of the steel drum and having less mass to accelerate on the gear change. The drum improves performance in competition, stock and super stock cars, especially when using a lower 1st gear ratio and is valuable in high HP cars that can leave the starting line at or below 4000 RPM on the brake by greatly increasing clutch life.

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