1973 340, want more power.

Richard McLaughlin said
I did have one wheel on ground.
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You're not doing it quite right: do it again as below.
nm9stheham said
3. For an open rear axle, you need to block the other wheel so it does not turn. Then rotate the wheel near to you exactly two turns, and count the number of driveshaft rotations. That will be your rear gear ratio.
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From your former results it sounds like a low 3 gear ratio.