Cummins NH 220 engine and transmission pack

Now updated to 1.58

Lastest Update Feb 10, 2026

Step into the cab of a true classic with the Cummins NH220 sound and drivetrain mod for American Truck Simulator . Known for its unmistakable steady idle and strong, deliberate pull, the NH220 has been faithfully recreated using high-quality multipoint synchronous recordings . Every detail — from the slow, rhythmic idle beat to the deep exhaust tone under load — has been brought to life for maximum authenticity.

This package doesn’t just deliver sound; it also includes a modified Spicer twin stick transmission setup . Traditionally a complex system with overlapping gear ranges, the layout has been adapted into a standard Eaton 18-speed pattern for ease of use. While the pattern is familiar, the gear spacing is historically accurate and much tighter — around 200 RPM per shift instead of the 400–500 RPM gaps of modern transmissions . To keep the NH220 in its powerband, splitting every gear is highly recommended , offering the player a unique and rewarding old-school driving experience.