This 12JS160T-1701170 synchronizer assembly is a core shifting component for FAST 12JS160T (Z-3016) 12-speed heavy-duty transmission. It realizes smooth gear engagement during shifting by synchronizing the rotational speed between driving and driven gears, avoiding gear impact, tooth chipping and difficult gear shifting. The synchronizer hub is forged from high-strength alloy steel, with precision machined friction cones and copper synchronizer rings, featuring excellent wear resistance and stable friction performance. It can withstand frequent shifting operations and high torque loads under heavy haul and mountain road conditions. Each synchronizer undergoes dimensional inspection, friction test and fatigue test before delivery. It effectively solves gear hitting, hard shifting and synchronizer failure issues. It is an essential replacement spare part for 12JS160T gearbox overhaul. We maintain sufficient inventory and stable bulk supply for repair workshops, fleet operators, auto spare parts dealers and global cross-border export customers.