Couple of simple ways. First look for a small metal tag on one of the diff bolts - would have 2 numbers that divided into one another would give the ratio. If no tag, jack both back wheels up, chalk mark at bottom of one of the tires and the driveshaft or U-joint, then rotate the driveshaft till BOTH wheels go around once (easy if posi). The number of times the drivehshaft goes around is your ratio.If you don't have posi and only one wheel goes around, multiply the driveshaft rev's by 2 to get the ratio. Just make sure only one wheel moves .You'll likely end up with a number in the 3's - like about 3.2, 3.08, 3.5, 3,9 etc.
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