Division 3+ Rules – 2021


Tractor Year: 1970 and Older

Age of Driver:

Age of Driver Must Be of Age That Will Enable Them to Operate the Tractor in a         Safe   and Proper Manner. Those under 18 Years of Age Must Have a Parent/guardian Signed    Insurance Waiver, Good for the Season, on File with OSATPA 

Classes: 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7500, 8500, 9000 #


18.4 x 38 maximum allowed in all classes.  Cut tire allowed. No radials or no steel wheels. Two wheel drive only. Any width rim is allowed.


Any Gear, Speed Limit 4 Mph. Speed Will Be Checked by Radar. No Shifting of Ta’s.


Weights Must Not Extend Rearward beyond Rear Tires and Cannot Be More than 11 Feet from the Center of the Rear Axle to the Furthest Point Forward.


 Tractor Engine Must Be Stock or Engine Must Be from Original Manufacturer and Bolt in without Modifications Using Existing Bell Housing and Motor Mounts. Frames, Transmission, Rear End and Axle Housings Must Be Original or Manufacturer’s Replacement. Stock Heads and Their Replacements Are to Remain Unchanged in outside Appearance. Dual Exhaust Not Allowed except after Stock Manifold. Tractors Must Be Naturally Aspirated. No Turbos or Blowers – except 99 Gm Olivers, Etc. Replacement Carburetors with No Modifications of Carburetor or Manifold. Overhang of Carburetor to Manifold Is Not Allowed. Only Stock Appearing Manifolds Are Permitted. Enhanced Electrical Systems Permitted in All Classes. No Rev Limiters Allowed.


 20% Margin of Error Will Be Permitted. All Tractors Must Have Positive Throttle Stops

Hitches/Draw Bars:

 Draw Bars Must Not Exceed 20 Inches in Height or Be Less than 18 Inches from the Center of the Rear Axle. No Part of Draw Bar May Extend Rearward beyond the Point of Hook. No Clevises. Hitch has to a 3.75” hole with 1” material thickness around the hole or a straight clevis bolted or pinned tightly to the drawbar with a minimum of 3.75” hole. Top of hitch adjuster cannot be above center line of axle or hub. Hitches and drawbars must be stationary in all directions. Hitches or drawbars cannot be moved when pulling down the track.


Gas, Diesel, or LP Fuels Only. No Alcohol or Nitrous Oxide Fuels May Be Used in Tractors. Gas Is Allowed a Maximum of  750 Specific Gravity. All Tractors Are Subjected to Random Fuel Checks. Tractors Manufactured to Use Diesel Fuel Only Cannot Be Converted to Gas or Lp.