Abstract: A drop box transmission is especially suited for use in heavy equipment of the four-wheel drive, bi-directional Type 1, that is capable of being driven in opposite directions with equal speed and power ranges. The transmission has a four shaft drop from an input shaft carrying high and low range gears alternatively driving a second shaft positioned below the input shaft. A series of gears mounted rotatably on the second shaft are in constant mesh with compatible gears on a third shaft below the second shaft. The second shaft gears are selectively and alternatively engaged with the second shaft to be driven by it. Each of these gears is in constant mesh with a corresponding gear rotating with a third shaft below the second shaft. The third shaft drives a drive gear meshing with a forward drive gear on a fourth, output shaft below the third shaft and also drives a gear on a reversing counter shaft carrying a second gear meshing with a reverse drive gear also carried on the fourth shaft.