Another way to tell for sure is to jack the rear of the car up and put a mark on the drive shaft and one on the tire, and count how many times the drive shaft turns for 1 turn (360*) of the tire. If the D/S turns approx. 3 1/2 times with one turn of the wheel you have 3.55s. 3 3/4 = 3.73 etc.
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