GM TH400 Forward Clutch and Direct Clutch Assembly w/o Clutches - Racing When roller rocker arms are

When roller rocker arms are installed

Speedmaster LS-series cylinder heads are rapidly expanding

Speedmaster machined aluminum water pump pulley nose cones are constructed from top-quality 356 aluminum alloy that's heat-treated to T6 specifications

Put together your own custom exhaust system with these Speedmaster collector reducers

Every Speedmaster flexplate will withstand the extreme power and rpm of your performance application

GM TH400 Forward Clutch and Direct Clutch Assembly w/o Clutches - Racing When roller rocker arms areThe Speedmaster forward drum and direct drum assembly are designed to withstand high horsepower with their upgraded 36 element sprag design. Speedmaster GM automatic transmission parts are manufactured using the highest quality materials for strength and durability.