Jack the car up. Crawl underneath and have somebody turn the wheel over 1 full rotation. Count how many times the driveshaft spins. Be accurate, you need to be within 1/4 of a spin on the driveshaft.
If it goes almost 2 3/4 times, you've got 2.73's. If it goes 3 times you've got 3.08's. 3 1/4, you've got 3.27's. 3 1/2, 3.55's. 3 3/4, 3.73's. A tick over 4, 4.10's. So on and so on.
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