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1998 CHEVY SILVERADO SHIFTED FINE LAST NIGHT TODAY IT WONT SHIFT FROM FIRST
on 1998 Chevrolet 1500 Pickup

350 AUTOMATIC TRANS.

Asked by for the 1998 Chevrolet 1500 Pickup
In case you haven't figured it out yet, it's probably the Speed Sensor located at the back of the transmission, on the side - I think on the driver's side. Unplug it and I believe one bolt holds it in.
Auto Zone has them for $23.