Abstract: A grain delivery mechanism for use on the rear wall of a dump truck includes a first gate slidably mounted on the rear wall for closing the large opening through which rapid discharge or dumping of the grain occurs, a lever system for raising and lowering the first gate, i.e. moving the first gate between the closed and open positions, a smaller opening in the first gate aligned with a portion of the large opening when the first gate is closed, a second gate slidably mounted on the first gate for opening and closing the smaller opening, and a chute defined by a plate with a discharge opening therein and telescopically extensible pipe sections slidably mounted on the first gate in front of the second gate, so that opening of the second gate when the first gate is closed permits controlled directional discharge of the grain through the smaller opening and chute.