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  #11  
Old 02-08-2012, 07:52 PM
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No CAI installed. I actually popped the clamps off the airbox tonight and cracked the lid a couple mm just to change the airflow a bit and took it for a short ride...no change, still whistling.
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  #12  
Old 02-08-2012, 07:57 PM
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Mine does it too. I took it to my dealer. They told me it is whine from the rear differential. It's not the MDS kicking in. I can be running with the range selector on (so MDS is off) and still get the noise. It's not a growling or grinding sound.
The dealer told me that they could make the noise go away by messing with the rear diff, but I would lose some low end torque, or something, blah blah blah.

Don't know why your dealer told you it was the MDS kicking in, because running with the range selector on and MDS off my truck will still do it.
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  #13  
Old 02-08-2012, 08:02 PM
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Try driving slowly with your radio off. 1100-1200 RPM is when mine does it. When going slow, I need to be putting in some power through it. As soon as I let off the gas, it pretty much goes away.
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  #14  
Old 02-08-2012, 08:46 PM
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Yes mine is acting exactly the same as what you describe in the last two posts. I can't imagine its the differential, does your sound like an air sound or more mechanical? I guess i could just be totally wrong, but it just sounds so much like a whistle. Definitely that 1100-1200RPM range.
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  #15  
Old 02-08-2012, 09:34 PM
CLOTAGAMES CLOTAGAMES is offline
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Same noise here-Did not have it on my 11-Reminds me of a vacuum leak.
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Old 02-08-2012, 10:18 PM
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Mine sounds like blowing across the top of a beer bottle. Does that describe what you are hearing?
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  #17  
Old 02-08-2012, 10:28 PM
R.Wilcox R.Wilcox is offline
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Hey all, I too Just recently purchased a NEW 2012 RAM 1500 SPORT. Quickly discovered that it makes a slight whining, or humming sound when trying to maintain speed anywhere from 20-60km/h. Doesn't seem to be consistent with any type of shifting, mostly acceleration!! can have the pedal pressed down 1/4 of an inch, and the noise will occur, and as soon as i let off, it will instantly stop. This humming remains when trying to hold speed at say 40km/h, and even sometimes remains when letting off gas and truck is downshifting. BUT when on highway trying to hold 100km/h, it doesn't occur. The kicker of all this is that i have test drove 2 other RAM's of the same year and model, and they both seem to do the same thing!! If anyone has any insight on this, or knows what it could possibly be, the help would be greatly appreciated as well.

Tks, Ryan
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  #18  
Old 02-08-2012, 10:46 PM
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Ramsail, yes mine sounds very much like blowing across the top of a beer bottle.

I also agree it seems similar to a vacuum leak, and R. Wilcox mine also doesn't make the sound at highway speeds either. It all seems to be related to that 1100-1200 RPM range for me while applying very little or no gas.

Seems like ALOT of 2012's with the exact same "issue", hopefully someone comes up with a fix. As CLOTAGAMES said, his 2011 didn't do this. I just posted this last night and we already have 5-6 people with the same issue.
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  #19  
Old 02-08-2012, 11:42 PM
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My truck also does this also. I assumed it was the mds but it seems from you guys that that is not the case. So far it is only happening when I have cruise control set between 30-35 mph.
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  #20  
Old 02-09-2012, 05:56 AM
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Well, lets try to do some group diagnostics, if they are saying it is the differential, which diff(s) do you have? If we all find out that we have the same gears and no other gears have the noise, that is a place to start. Mine is 3.92, 4x4, no limited slip. Yours?
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