For 2WD Tractors (4WD Assist) measure the antenna from the Fixed (Rear) Axle Positive number if the antenna is in front or Negative number if it is behind, On Articulated 4WD the Fixed Axle is the Front Axle, for BEST results get the antenna over the fron axle, but if not possible the get an accurate measurement again Positive number if it is in front of the front axle and negative for behind the front axle. How new of a tractor is this b/c if it is very new and has a tight steering the you may not need to mess with the freeplay, leave it at defaults and try it, if you're not happy with performance then try adjusting.