working dog, there's more to checking your ratio than dlj's method. after you get the number of spins on the pinion gear as opposed to the ring, you double it to get the ratio. For instance about 2.13 turns is a 4.27. And 2.7 turns is a 5.38. The reason is the spiders on a standard differential eat up half the revolutions. To do this method 1 wheel needs to be on the ground. On a Posi the method changes, lift both wheels and count the revolutions of the pinion and that's your ratio. It's harder to lift both wheels on a standard differential and spin, because of the erratic operation of the spiders. I haven't used this method once or twice, but a couple of hundred times, I was the axle identification guy at 2 different salvage yards in a previous century. For me it was actually easier that reading a rusted crappy bent tag anyway. if it was even there at all. diggerG