Flawed test? What gears have I?

I want to find out what gears my 8 3/4 has... So I marked the driveshaft and the right rear wheel. I carefully rotated the tire one full revolution. The driveline rotated just under 1 1/2 times. I checked it 3 times. What the heck ? Makes no sense.

Does it matter that the car is on jack stands? Or does it matter which way to rotate the tire?

What the heck is wrong here?? I'm assuming the car has to be on the ground... Is that the case?

Please try not to make me feel any more ignorant than I already feel :-/

OKAY I JUST WENT AND DID THE TEST AGAIN ... Same result
Author: admin