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So I jacked up 1 tire and spun the motor. I know the figures I got are wrong (5.5 motor rev per 1 tire rev in first). Guess both tires must be moving to be accurate"

You need to spin the raised tire TWO revolutions while counting the motor turns. This is for a non-posi drive train.

If you have a positraction axle, then you turn both of them ONE turn.

My Yugo comes out to 15:0 to 1. in first gear.
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