A mower is suspended from a frame and includes a header with a cutter. A tongue is pivotally connected to the mower frame and is moveable with respect to the frame by a hydraulic cylinder. At the front of the tongue is a front gearbox rigidly attached to the tongue. The front gearbox transmits rotary power from the power take off of the tractor to a rear gearbox pivotally attached the header and from the rear gearbox rotary power is passed on ultimately to the rotary cutting units. Pivoting of the rear gearbox is controlled by a steering connection operatively attached between the front and rear gearboxes.