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.