The Chevrolet K20 was the four wheel drive, 3/4 ton variant for the 1st Gen Chevrolet C/K that debuted for the 1960 model year. Only available in a standard cab pickup body style, these trucks were available with an 8 foot bed, which was available with the Stepside or Fleetside beds. The Stepside bed featured fenders and a step in front of the rear wheel, while the Fleetside bed featured straight sides. Over the course of production, the 1st Gen K20 was powered by a selection of inline six engines, as well as an optional V8, with power ranging from 135hp to 220hp. Both manual and automatic gearboxes were offered. Production of the 1st Gen Chevrolet K20 lasted until 1966, when Chevrolet introduced the 2nd Gen C/K.