It wouldn't be 2.50. My guess is it turned 3.5 times. Make sure you rotate the wheel one full rotation. I normally use the valve stem and start with it down at 6 o'clock. A chalk mark on the driveshaft makes it easier to see.So I jacked up rear end and drive shaft spun 2.5 turns. Does that mean it as a 2.5 gears? Never heard of that low. And doesn’t help me change gears to drop rpm?!?