1358 203 237 Right Countershaft Assembly, manufactured in accordance with original factory standard technology with high material density and good toughness. The gear profile is processed with strict precision for smooth meshing and uniform stress bearing. It can withstand high torque output, resist impact and avoid gear breakage and deformation. With precise matching dimensions, it features good disassembly compatibility, low operation vibration and low failure rate, suitable for complex road conditions and heavy-duty transportation scenarios. Perfectly compatible with ZF 12TX2421TD 12-speed automatic gearbox.
1358 203 237 Right Countershaft Assembly
1358 203 237 Right Countershaft Assembly is integrally formed with dedicated heavy-duty steel following original manufacturing standards. It offers high gear surface hardness, impact resistance and fatigue resistance, maintaining even stress under rough road conditions and heavy climbing loads. It ensures smooth meshing, reduces vibration and noise, and features accurate dimensions for easy replacement and perfect fitting. With stable performance and low failure rate, it is ideal for repair and replacement of ZF 12TX2421TD 12-speed AMT automatic transmission countershaft assembly.






