Remanufactured from Weller, the ZF 12AS2300BO Astronic transmission delivers 12 forward speeds, smooth automated shifting, and proven durability for heavy duty trucks and coach applications. Built to OEM ZF standards, this model is designed for optimal fuel efficiency, reduced driver fatigue, and long-term reliability. With its advanced shift logic, robust construction, and efficient power transfer, the 12AS2300BO helps fleets minimize downtime, lower maintenance costs, and maintain dependable performance mile after mile.