This ZF 1358 304 256 mainshaft is specially designed for ZF 12-speed AMT transmissions. Made with high-strength alloy forging technology, its torsional strength and fatigue life far exceed industry standards. Precision spline machining ensures zero-clearance engagement with sliding sleeves and gears, delivering up to 99% transmission efficiency and faster shift response. Factory-grade dynamic balancing suppresses high-speed operation vibration and effectively reduces transmission noise. Suitable for commercial vehicle applications such as heavy-duty trucks and buses, it is a core component ensuring stable power output of the transmission.
1358 304 256 Main Shaft
Part No. 1358 304 256 is the mainshaft assembly, designed for ZF 12AS series 12-speed AMT transmissions and serving as the core power transmission component of the gearbox. It features an integrated precision-forged structure with carburized and quenched surface treatment, delivering excellent wear resistance and impact resistance to adapt to various heavy-duty operating conditions. The mainshaft is integrated with mounting positions for multi-speed gears, which work with sliding sleeves and spline sleeves to enable gear shifting. OEM-level dimensional accuracy ensures perfect fit with all matching parts. Replacing this part can restore the transmission’s power transmission performance, extend the overall service life of the gearbox, making it a key original equipment part for commercial vehicle transmission maintenance.
