Position the chute facing straight ahead.
Hold the new gearbox over the chute and align the flat sides of the gearbox shaft with the flat sides on the chute bracket receiver.
Push the gearbox shaft down into the chute bracket receiver and onto the chute support bracket.
Reinstall the mounting bolt through the gearbox and into the chute bracket.
Reinstall the mounting bolt through the gearbox and the chute support bracket and secure it with the wing nut.
Reinstall the pin through the chute support bracket and the bottom of the gearbox and secure it with the cotter pin.
Center the trigger on the control panel and make sure that the chute is still facing straight ahead to align the trigger control.
Insert the end of the chute rod into the new gearbox.
Align the holes in the chute rod with the holes in the gearbox drive shaft receiver and reinstall the cotter pin.