What does 6×4 mean for a tractor truck?

[VanMartin]

Tractor truck 6X4 refers to the vehicle's drive configuration, indicating the truck has a total of 6 wheels with 4 being drive wheels. The number before the 'x' represents the quantity of wheel sets, while the number after 'x' denotes the number of driven wheel sets. A 6x4 model means the vehicle has 6 wheel sets, with 4 sets being powered. 6X4: 6X4 indicates a dual-rear-axle, single-front-axle configuration with 6 wheels in total (4 drive wheels). In contrast, 6X2 represents a dual-front-axle, single-rear-axle setup with 6 wheels total (2 drive wheels). Front and Rear Axles: Front and rear axles refer to the wheel axle components. The front axle includes suspension springs, steering gear, balance shafts, etc., while the rear axle additionally contains drive shafts and transmission gears. Multi-axle trucks further differentiate between driven rear axles and non-driven rear axles. Non-driven rear axles lack propeller shaft connections and aren't part of the drive system, typically found only in heavy trucks and tractor heads with three or more axles.