Transmission was rebuilt but still won't shift. Could the speed sensor be bad? on 1994 Ford Taurus

Car tries to shift when cold but won't come out of first after warming up

Asked by for the 1994 Ford Taurus
Take it back to the rebuilder for warranty repair.
I rebuilt it myself and the sensor did not work. Im guessing the value body is shot
Possible! I guess you are just going to have to fix it for nothng or you might lose this customer! Got a scanner?
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How long has it been since rebuild, take it back to have it checked. AAmco will do a free estimate.