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Will the speed sensor in a Chevy s10 blazer make truck not shift?

A faulty speed sensor in a Chevy S10 Blazer can absolutely prevent the truck from shifting correctly, or at all. The transmission relies on the speed sensor's input to determine the appropriate gear and shift points. If the sensor is malfunctioning or sending incorrect information, the transmission control module (TCM) won't know what gear to select, leading to problems shifting. The symptoms can range from rough shifting to complete inability to change gears.
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