A 400 km/h truck needs downforce—something standard trucks lack. Advanced mods adjust the drag_coefficient and wheel_friction so the truck doesn't take off like an airplane at 350 km/h.
requires a combination of disabling the built-in limiter and installing custom high-performance parts mods. 1. Disable the 90 km/h Speed Limiter euro truck simulator 2 speed mod 400 km h