Gear Ratio Confusion

I've got a narrowed Ford 9 Inch rear that came off a pro-street truck and can't seem to figure out the gear ratio. I tried spinning the passenger side for a full rotation and counting the amount of rotations the pinion spins, but the weird part is, it spins less than two full rotations. Could the gear ratio really be that high or am I missing something?

 

If it were me, I'd yank the axles and center section and count the teeth, but I do like doing things the hard way.

 

If you're spinning one tire (other on the ground?) then you have to spin it 2 full rotations. You can both tires 1 rotation or 1 tire 2 rotations and count the pinion rotation. Works out the same.
We've talked about it before.

 

Its just the rear end up on some blocks, its no longer on the truck

 

You need to spin the wheel two full revolutions ...........

"Shit I'm slow on the draw"

 

I'm a newbie! Just found a thread on it from a few weeks ago, got it now, thanks

 

Since it is out this is a good time to pull the diff and check the condition of the gears and bearings. Count the teeth on the ring gear and divide by the number of teeth on the pinion. The ring gear might already be labeled.

 

Here's a good little primer, on the subject ......... http://www.jedi.com/obiwan/jeep/misc/gearratio.html