Custom gearboxes are required to keep the engine from redlining instantly, allowing for the massive top-end speed required to hit 400 km/h.

On the surface, Euro Truck Simulator 2 is about patience. It's about planning routes, managing fuel consumption, and delivering fragile cargo without causing a scratch. The default game even includes a "Truck Speed Limiter" option that caps you at roughly 90 km/h (about 56 mph), mimicking real-world EU regulations for heavy vehicles.