TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline while increasing your engine performance

while increasing your engine performance

or larger wheels to clear them

They are welded from high quality steel with performance screens

a cable retention ring

These Speedmaster aluminum water pump pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 specs

TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline while increasing your engine performanceTake your GM TH400 transmission to the next level with this premium heavy duty forward drum and 300M input shaft combo. Engineered for high power street, strip, or off road use, this kit addresses the critical failure points of stock components with a focus on strength, precision, and reduced rotating mass.