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Truck noise- What is it?
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Truck noise- What is it? - November 4, 2010, 08:20 PM

http://www.fileupyours.com/view/274681/truck1.wma

It comes from the rear of the truck- '99 Dakota 4x4

Audible when there is even the slightest bit of throttle applied, but not when it's let off unless braking fairly quickly. The frequency increases with speed. More load on the engine = louder noise.

The rear diff oil was changed and new rear u-joint were installed maybe 1000 miles ago and the sound remained.

Something in the diff screwed up?


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November 4, 2010, 08:46 PM

how hard is it to pull the rear diff cover for an inspection? How many miles on the rear end? I've heard of 2 going out each with about 130k on them. Only problems they ever had with the trucks.


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November 4, 2010, 09:02 PM

The cover comes off easy enough, but getting the back of the truck up in order to rotate the gears is something else.

About 100k miles with quite a bit of towing a trailer.


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November 4, 2010, 09:42 PM

Only present under load: Rules out wheel bearings.

Sound definitely is friction, metal on metal. Almost sounds like gear whine - but you don't have straight cut gears.

Any vibration accompanying the whine?



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November 4, 2010, 09:57 PM

What fluid and weight did you put in it? Was it recently changed and this brought on the noise?


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November 4, 2010, 10:18 PM

Check your differential fluid. On my yukon I thought it was my brake pad and rotors going bad until it was too late and I had destroyed my differential. I went and bought a complete rear axle w/differential and had it install.
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November 4, 2010, 10:40 PM

had a dakota..look into a new rear end if you havent caught it intime... they're famous for biting the dirt.
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November 4, 2010, 11:42 PM

Wheel speed matched whine or rpm matched.

Sounds like the rear to me from the tape.
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