Now you're making me have to stop and think.....ooh that hurts the brain to do that! lol
I think I said that inside-out and sideways.....on the left side.
With one wheel on the ground, you would spin the tire two revolutions.
Or, one revolution with the tire, but then double the number of turns the driveshaft makes.
Or, multiply by 100, divide by 2, and add 10% for good measure.

 

Just pull the cover and see what you have. Check the ratio stamped on the ring gear OD and look if you have a limited slip. It is the only correct method.

 

if u want highway gears go 273s but there no fun if your trying to burn out just using the gas