The Tatra T813 was first conceived in 1960 as a prototype 4x4 heavy truck. However, its original concept was quickly expanded, and by 1967 the final production model evolved into a hulking 8x8 all-wheel-drive off-road military ATV, sporting a larger, more durable frame and a powerful V8 engine. To accommodate the demand for heavy trucks on the civilian market, the T813 was also produced in 6x6 and the original 4x4 drive variants.
An improved gearbox variant that offers a full range of gears at the cost of higher fuel consumption.
An alternative engine featuring improved resilience to damage, acceleration, and power output.
A heavily modernized engine variant tuned for better acceleration and durability, as well as increased power at the cost fuel efficiency.
A less-specialized gearbox built for increased top speed and higher gear count, as well as a minor increase in fuel efficiency and resilience while only leaving a regular Low Gear option.
A hulking monstrosity of a gearbox, this variant allows to fine-tune the Low Gear / R Gear transfer ratio in exchange for increased fuel consumption, especially in AWD mode or without proper maintenance.