Finding rear gearing, confused.

[CG]

So I’m trying to figure out what the gear ratio is on my 14 Bolt FF. There is no driveshaft or body, it’s just a chassis for now. Jacked up one side, spun tire one revolution and the yoke went a tad over two. Jacked up the whole rearend spun the other tire one revolution, yoke still went a tad over two. I feel like I’m misunderstanding how this works. I really don’t want to yank the cover and look at the markings, I just want to be close.