Power your truck with the StreetMonster Allison 1000 transmission—a legendary 5- or 6-speed automatic designed for performance and reliability. Renowned for its reliability and smooth performance, the Allison 1000 is an excellent choice for everyday driving, light towing, and standard diesel applications. Engineered to handle tough demands, it features advanced electronic controls, seamless shifts, and reinforced internal components to deliver long-lasting, consistent performance.