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Here are the rules for both classes, i just copied and pasted from the above link. your main differences would be rpm, speed, and turbo limits.
(1) Straight off the farm (a) All general rules apply (b) Factory RPM’s per the Nebraska tractor test manual for the make and model tractor being pulled may be checked at random (c) Stock drawbar, no welded on d rings, clevis must pin or bolt to the drawbar (d) Minimum of 20” from the centerline of rear axle to the point of hook on the clevis (e) Must be equipped with working PTO and Hydraulics (tractors manufactured prior to 1958 do not need hydraulics) (f) 16.9x38 tire size maximum in 4500 and 5500 (g) 18.4x38 tire size maximum in 7000 and heavier non turbo (h) 20.8x42 maximum in all turbo classes (i) No press steel rear wheels unless available as an option on the make and model of tractor being pulled (Example: MH 44 or JD A/ 
(j) Factory air cleaner, piping, and turbo piping (k) Factory carburetor, injection pump, and turbo for make and model of tractor being pulled (l) No aftermarket pusher pumps of any kind (m) Maximum drawbar height of 20 inches (2) After Chores (a) All general rules apply (b) Factory block, transmission, and rear end for that make and model tractor (c) Cast cylinder head or replacement head must appear factory (d) No Minneapolis Moline HD800 engine components (e) Any cast iron manifolds are allowed (f) Rear fenders required (g) Side shields allowed (h) No rpm limit (i) Hitches can be 20” in height and no closer than 18” from the hook point to the centerline of the rear axle (j) Updraft carburetors only, 2 cylinder John Deeres can have duplex carburetor (k) Any cut on tires allowed (l) No water injection (m) 2.4” turbo inducer size limit (n) Must retain factory type injection pum |
