A rear eject body for a truck is provided. The body includes a floor and a pair of opposing sidewalls. A tailgate extends between the opposing sidewalls at a rear end of the rear eject body. The tailgate is pivotally supported for movement between an open position and a closed position. An ejector is supported in the rear eject body for movement between a retracted position at a forward end of the body and an extended position at the rear end of the body. A tailgate actuation assembly moves the tailgate between the open and closed positions in response to movement of the ejector between the retracted and extended positions. An ejector guide assembly includes sleds that slide in guide tracks to thereby guide the ejector as the ejector moves between the retracted and extended positions.