Used by the top NASCAR teams, the Andrews A431 Transmission is a proven design with a supporting record of wins. Andrews provides a highly engineered transmission designed for durability and smoothness of operation. Utilizing years of experience, Andrews has a standard design that is compatible with all drivers and track types. A significant investment in state of the art CNC gear cutting, grinding and inspection equipment backs up the Andrews claim to make the highest quality, most reliable gears in racing transmissions. If you need to transfer high horsepower and torque from your engine to the axle, you need an Andrews A431 Transmission.