1316303071 Counter Shaft Gear: Compatible with ZF 16S2530 and 16S2531 16-speed main gearbox. A major transmission gear for the counter shaft, forged from alloy steel with hardened and wear-resistant teeth. Precisely processed tooth profile ensures smooth meshing, high transmission efficiency and low vibration. It bears long-term high torque load and resists impact and tooth damage. It matches accurately with main box gears and synchronizers to adapt to multi-speed shifting, fully meeting the demands of long-distance and heavy-duty driving of heavy vehicles.