I'm looking at buying a John Deere 4005. Can anyone tell me how tall their tractor measures from ground to the top of ROPS with industrial tires? How about ag tires? Also I've read posts and noticed this on an older JD 650 that to shift gears, you have to back down the rpms. Its suppose to be partial syncro, so you can shift on the fly just not change ranges or direction, right?