On Mon, Jan 12, 2009 at 19:15, Matt Beazer
<teseract@enchantedbookstore.com> wrote:
>
>
> A friend of mine has a 2000 Dakota SLT, 4.7L, 4x4, 5 speed manual with
> the "handling package", 9.25" rear end with factory limited slip.
>
> For the last year or so, it's been making a loud "whine" from the rear
> end that is speed dependant, but not throttle dependent. It starts out
> from a stop with a low noise, then peaks at 35mph, quiets down until 45,
> gets really loud, and keeps doing this through 75mph. It's like an odd
> resonance that can get loud enough to really annoy your ears and make
> talking in the cab difficult. We had originally changed the diff fluid
> 6-8 months prior by using a suction pump in the fill hole, then used Red
> Line "Shock proof" gear oil that had the correct rating per the owners
> manual, but that seemed pretty thin and looked (and smelled) like yellow
> puss. So we dropped the cover completely after the noise started and
> cleaned it out and re-filled with Royal Purple gear lube. This quieted
> it down by an order of magnitude, but it's getting louder again.
>
> Does anyone have any ideas on what this likely is? Like I said, it's
> not throttle dependent - you can put the truck in neutral and coast and
> get the same noise. It's just completely speed dependent and
> considering the Royal Purple quieted it down, it's definitely coming
> from the rear end.
Rear pinion area. My father had a whine from the rear end of his '00
Durango w/ the 9.25. He discovered a weeping pinion seal, took it in
to get fixed, and when it was all said and done, no more whine.
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