Question about 1996 Chevrolet K1500

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1996 chev k1500 whining drivetrain

1996 chev k1500 cheyenne 5.7L manual trans: a whining sound from drivetrain that matches vehicle speed; no different when in or out of gear, or when turning, or foot off gas pedal. Higher pitch when faster, and ''wobbles'' almost like a warped brake rotor. Those probably bad too but not this. Just recently replaced the whole rear axle/diff unit and new clutch last year. U jts assumed OK. Would a bad transfer case bearing (?) make this noise? I have also noticed recently the shifting to be ''touchy'' as in less than optimum ''syncro-mesh'' i.e., gears grind easier if I am not more careful, as if (and i have no idea if this works) the gearbox (?) lost a bolt and is off center or something. I assume the two could be related.

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It sounds like you differential gear noise by your description.

Posted on Mar 23, 2017


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Posted on Jan 02, 2017

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SOURCE: whirring/whining noise from rear trans-axle

check your rear end and make sure it has plenty of gear oil..if full then there is friction in it somewhere and it is probly getting ready to go out.

Posted on Dec 02, 2008

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SOURCE: "1991 Chevy Cheyenne 4X4 K1500

The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.


Fig. 1: Engine Coolant Temperature (ECT) sensor location-4.3L, 5.0L and 5.7L engines


  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not met specification shown in the temperature versus resistance chart, it must be replaced.
  7. The sensor may also be checked in the vehicle. Unplug the sensor and attach a digital ohmmeter to the two terminals of the sensor.
  8. Using a calibrated thermometer, compare the resistance of the sensor to the ambient air temperature.
  9. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  10. If the sensor does not met specification shown in the temperature versus resistance chart, it must be replaced.

Fig. 3: The ECT sensor is usually located near the thermostat housing


Fig. : Engine Coolant Temperature (ECT) sensor wiring diagram


Fig. : Engine Coolant Temperature (ECT) sensor temperature vs. resistance values

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Posted on May 28, 2011

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its the speed sensor located on the drivers rear side of the transfer case, it has a 2 wire plug, the sensor screws into the tcase and is really easy to replace and fairly cheap at any parts if you buy the new one first it will help you find it by matching it up its a common problem with this vehicle, when it goes out the speedo quits and the computer doesn't know your moving so it doesn't shift the trans properly

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