Remanufactured from Weller, the ZF 12AS2301BO Astronic transmission with Intarder delivers 12 forward speeds, strong torque capacity, and integrated retarder braking performance for coach and transit applications. Built to ZF OEM standards, this model handles up to 2300 Nm input torque, includes the Intarder 3 system for improved speed control and downhill braking, and weighs around 330 kg including the retarder. With oil capacity around 22.5 litres for initial fill and provisions for Intarder accessories, it helps reduce service intervals, enhance safety, and improve driver control in demanding routes. Weller’s precision rebuild process ensures long life, reduced downtime, and dependable performance mile after mile.