ANSWERS: 1
  • I would check the Transmission Output Speed Sensor (TOSS) This supplies the speed signal to the ECM that uses it for engine control, ABS rear speed signal and the speedo. If the RED brake light is on you should be very careful driving your truck. Without the rear speed the vehicle has lost Dynamic Rear Proportioning (DRP) This system keeps the rear wheels from locking up during normal driving. If it is not working you could spin out without warning. Check the connector and wires and check the sensor itself. It is located on the trans tailshaft near the front U joint.

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