i have my first sts its a 9770 2wd machine with the 600 metrics on the rear. it has a sticker on the wheels about the rear axle cannot be sqeezed into 120" spacing. so now i have 50 hours on the machine and the rear tires are taking some serious stubble damage to the outside edge of tire. i want to put them in narrower, but what is the limitation? has anyone tried this? is there a wheel dish, axle ajustment/steering stop combination to make this work? thanks