Abstract: A drop chute extension for unloading a shuttle dumping transport vehicle for harvested cotton bolls extends the length of the conveyor dump side wall when unloading the transport vehicle. The extension of the conveyor dump side wall allows cotton to be dumped in the middle and far side of a module builder or trailer. The drop chute extension can be folded over and down into the basket of the dumping transport vehicle, reducing both the transport height and width of the vehicle. The drop chute extension includes two hydraulic extension arm cylinders which cause the door chute to extend or retract and are interconnected with the hydraulic system of the vehicle lift basket. Operation of the basket lift cylinders is precluded until the extension arm cylinders have fully extended the chute door. The drop chute extension is also joined to a second hydraulic system to operate an unloading conveyor which extends into the extension.