Ummmm, it's fairly simple...the back of the tractor is lower than the front...could be for any number of reasons...tires on the front could be a wee bit taller than "stock spec"...tires on the back might be a bit small or worn...back end of the tractor is heavier than the front end...might be parked on a slight,slight incline. Tomorrow we send out an exploratory team with scientific equipment to ascertain the exact cause of this most minor misalignment mystery....Shaggy and Scooby and Velma are on their way!!!! Rest easy, TPF'ers, rest easy. Crack open another and await the findings from the exploratory team.