Flawed test? What gears have I?

OldmanRick said

I believe you have a open carrier (non-suregrip). The other tire was probably rotating in the opposite direction during you test. Either get someone to hold the other tire still while testing or lower one side of the car to hold one tire still. If everthing rotated perfectly, you'd have a two gear in it, but the only way to tell for sure is to hold one side still while testing.

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While doing this with an open diff, the tire which is spinning (while one is held) turns 2 times as fast as its normal speed, due to the spider gearset multiplying rpm. Therefore, if both tires turned equally, your driveshaft would turn 3 times. You have either a 2.93 (I think that is right number) or 3.23 ratio. Try to be more accurate to find out exactly. With an open diff, if you spin only one tire, that tire is actually going twice as fast as your speedo says.