The flanged rear housings were standard on the high drum cotton picker tractors. The bull gear housings were bolted to these flanges to both raise the tractor and reverse it's direction wnen the picker was mounted. At the end of the pcking season the picker, bull gears, and tall front wheel were removed and the traactor could then be used for all normal uses the rest of the year. The highdrum picker head was 20 spindles high and the low drum cotton picker head was 14 spindles high. The low drum pickers "fliped the differential" to reverse the direction of the tractor when used under the picker and the low drum tractor was not raised as was the high drum.