Remanufactured from Weller, the Detroit DT12OA1CD transmission delivers overdrive performance with cooler-ready capability and double clutch technology for heavy duty trucking applications. Built to OEM Detroit standards, this model provides 12 forward speeds, automated shifting, and a robust design engineered for long-term durability. With improved cooling provisions, smoother gear transitions, and reduced maintenance needs, the DT12OA1CD helps fleets minimize downtime, improve fuel efficiency, and maintain dependable performance mile after mile.