No over-ride devices allowed. The only fuels allowed are those recommended by the manufacturer or gasoline.
Power blocks are an acceptable substitute.
All tractors may pull in lst or 2nd gear as provided by the manufacturer in the stock classes. Tractors can pull in lst, 2nd or 3rd gears. The pace rope will run at 4 mph. No slipping of the clutch once engaged. While hooking the tractor, the driver must have hands up and foot off the clutch.