TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline This adapter plate kit solves

This adapter plate kit solves that problem

and then nitrided for durability

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

or larger wheels to clear them

the blue anodized aluminum construction delivers performance and a show car quality appearance

TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline This adapter plate kit solvesTake 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.