Question about Chevrolet Silverado 1500

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My truck has a whinning gear noise at low speeds, 25MPH and lower. As I increase speed it gets louder until I get over 25MPH and then I can not hear it anymore,it does the same thing when slowing down, it sounds like it is coming from the front end maybe in the 4 wheel drive unit. The truck is a 2006 chevy siveredo crew cab z71 4x4

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  • rdavis1049 Jul 12, 2010

    just looking for some advice on possiable problems.



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  • 6,826 Answers

Sounds like the transmission is whining, maybe the orbital gear inside the transmission or even the torque converter.

How are the transmission fluid levels, up?
How are the differential front and back fluid levels, up?

If you're accurately hearing the problem, maybe the front 4 wheel drive transaxle is making this sound, but if you're not in 4 wheel drive this makes no sense because the front should be unlocked or locked automatically, if that's the way it works.

There is a differential carrier assembly in the front:
Differential Carrier Assembly Removal & Installation To Remove:

  1. Turn the steering wheel all the way to the left.
  2. Raise and safely support the vehicle.
  3. Place jack or utility stands at the rear end of the vehicle.
  4. Remove the engine protection shield and front differential carrier assembly shield, if equipped.
  5. Drain the fluid from the differential carrier.
  6. Remove the front drive shaft from the differential carrier assembly.
  7. Remove the relay rod.
  8. Support the differential carrier with a transmission jack or equivalent.
  9. Remove the wheel drive shaft inboard flange bolts, both sides.
  10. Disconnect the electrical connector and wiring from the actuator and carrier assembly, if equipped.
  11. Disconnect the vent hose from the differential carrier.
  12. Remove the inner axle housing nuts and washers from the bracket.
  13. Remove the differential carrier upper mounting bolt and the nut.
  14. Pivot the differential carrier assembly forward and down on the lower mount bolt while supported by the transmission jack.
  15. Secure the differential carrier assembly to the jack.
  16. Remove the differential carrier lower mounting bolt and the nut.
  17. Remove the differential carrier assembly.
To Install:
  1. Install the differential carrier assembly.
  2. Install the differential carrier assembly lower mounting bolt and the nut. Do not tighten the bolt at this time.
  3. Pivot the differential carrier assembly up and back on the lower mount bolt while supported with the jack.
  4. Install the differential carrier assembly upper mounting bolt and the nut.
  5. Install the inner axle housing washers and nuts to the bracket.
    • Tighten the inner axle housing nuts to 75 lb ft (100 Nm).
    • Tighten the upper and the lower differential carrier mounting bolts to 75 lb ft (100 Nm).
  6. Connect the vent hose to the differential carrier assembly.
  7. Remove the transmission jack from under the differential.
  8. Connect the wire harness and connector to the differential carrier assembly, if equipped.
  9. Install the wheel drive shafts.
    • Tighten the flange bolts to 58 lb ft (79 Nm).
  10. Install the relay rod.
  11. Install the front drive shaft.
  12. Fill the differential carrier assembly with the correct fluid.
  13. Install the front differential carrier shield, if equipped.
  14. Install the engine protection shield.
  15. Remove the utility stands.
  16. Lower the vehicle.
My truck has a whinning - prev.gif next.gif

Posted on Jul 12, 2010

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  • Master
  • 1,857 Answers

The only way to accurately diagnose this is in person. There are not any TSB's on this condition. If you have gear whinning or a pully issue is hard to say at this point. Alll anyone can do here is guess aand a guess will not fix it.

Posted on Jul 12, 2010

  • Susan Price Jul 12, 2010

    I am aware of that but unless this truck is on a rack noone will be able to isolate the noise without actually listening. For all we know you could have a wheel bearing noise, but if it is a front differential noise, special tools will be needed to rebuild it correctly or else you will end up with the same problem. Also the cover will need to be removed to inspect for gear deterioration and play. Also if you remove the front driveshaft this will take the stress off the dif and if the noise goes away then you most likley will need to rebuild it.



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