For sale is an attachment used to dyno 4 wheel drive tractors that do not have a pto. This unit bolts on to the center of the tractor and hooks to the rear drive shaft. after unhooking the front drive shaft, the tractor can be dynoed. Equipped with a large 1000 pto shaft. The name on the tag is unreadable. Make an offer Call, text, or message on here 620 52l ll03