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1977 Toyota Transmissions

My toyota (5 speed) runs 3500 rpm at the speedo’s 70 mph. The speedo is showing 70 but actually is running at 60 mph. Something is not right and I’ve noticed in old Toyota car club sales, other similar models always end by saying their transmission numbers match! What significance does this have. I know my car (recently purchased) has a problem. . . ideas???

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Thank you!