The Iso BM Volvo T 800 was introduced in 1966 as the successor to the Bison 470. When it came to market, it had a very modern appearance. The T 800's engine was a new 5.1-liter six-cylinder with a power output of 94 hp. The T 800 was equipped with a 14" clutch, drawbar sensing, power take-off, and alternator. The cabin was manufactured by Hara and was nowhere near as good as the later one in the T 650.

The turbo model T 810 and its four-wheel-drive version T 814 were introduced in 1969. They had 113 hp. Power was increased in 1972 (various versions of power ratings have been reported in different sources). In 1975, the engine grew to 5.5 liters and power increased to 106 and 136 hp. An overdrive gear later became an optional extra for the rear-wheel-drive models. The front axle of the T 814 came from Volvo’s four-wheel-drive loaders.

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