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To determine if you have a posi or an open centersection, raise the wheels off the ground, chock the front wheels, and put the car in Neutral. Spin one wheel—if the other spins the same direction, it is a posi; if it spins the other way, it is an open carrier. You can approximate the gear ratio by counting the number of times the yoke revolves versus the wheel by marking them and counting the rotation. This is a non-posi, so we held one wheel and spun the other ten times and the yoke went around 15 times. 15 x 2 = 30, divided by 10 gives us a 3.00 axle ratio.