I'm jacking up one side of Rear axle, no prop connected. I then mark bottom of tyre at 6 o'clock that's off ground. I do the same on diff flange accept I have that marked 1 to 10 for an accurate reading. I then rotate the flange till the tyre has completed 1 full 360 rotation ...it only takes just over 2 full turns on the flange to complete one full turn of the tyre. Is that correct ? Ronnie