SAE J1377
SAE J1377 2011-JUL-01 Transmsson Mounted Vehcle Speed Sgnal Rotor Specfcaton
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This SAE Recommended Practice covers the transmission output shaft mounted signal rotor and sensor mounting hole used for electronic speed sensing on Class 6, 7, and 8 highway vehicles.
Purpose—To standardize the number of discontinuities sensed (such as teeth or slots) per revolution of the transmission output shaft.