For first time in over 25 years I will have some corn to sell for grain this year. Only 8 acres but there may be some for the next few years as well since I will not be needing all my corn acres for silage. I am considering getting a JD 45 in very good condition , shed kept and last used 3 years ago. After doing some measuring on it today I need to know if the front wheel tread spacing can be narrowed some by mounting the wheels with the rim concave in. They are currently mounted concave out and giving an 84 inch center of tire to center of tire spacing . At this spacing the outside of the tires will hit some of the next standing row of corn in places where the row spacing on the next pass of the 4 row planter got a little close. Does anyone know off hand or has a manual they could check to see if wheels can be run concave in and what spacing this would give? Thanks.