If your speedo is out by 10 mph , at all speeds , the problem is probably in the speedo head.
If your readings are out by 10 % at all speeds you may be able to have the sensor/speedo , re-calibrated.
If there was a big discrepancy , between the transmission input speed sensor and the output speed sensor , you would have shifting issues and probably fault codes set in the trans controller , and maybe a check trans light on.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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