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Discussion Starter #1
Hey guys,

I just picked up an '07 OR, and when cruising at freeway speeds, everything is quiet until I release the throttle and coast, then the rear diff makes a nice little howl...is this normal behavior, or should I take it to be examined?

Thanks!
 

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Discussion Starter #4
Yeah, the low oil possibility did strike me, especially considering the apparently rather common factory practice of under-filling.

I'll check 'em and fill with conventional oils 'till I have a few thousand miles on the truck, then I'll switch to Royal Purple or Mobil 1 or something.
 

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Discussion Starter #7
Thanks, duly noted....mine is an '07 OR, so I assume that it takes the 75W-140 viscosity....

Interesting though, the synthetic bit isn't mentioned in the 'Fluids and Capacities' sticky thread....but I normally use synthetic anyway.
 
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