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-   -   What causes this little whining sound at high RPMs on Ram trucks? (http://www.ramforumz.com/showthread.php?t=104616)

starquestbd22 02-15-2012 10:10 AM

What causes this little whining sound at high RPMs on Ram trucks?
 
Hi all. Question out of curiousity....what is it that causes the faint whining sound that some (or maybe all...dunno) Ram trucks do at higher RPMs? Mine does it and it's actually rather loud in the truck. I'm pretty sure it's just a design function because I have noticed it on several other Rams as well. Not sure if it is specific to 4.7L or 5.7L but by nature I have only noticed it on trucks with the auto tranny. Is it a belt whining, similar to a supercharger belt? Is it some part of the air induction system? Hopefully it's not actually the tranny. Here's a vid to illustrate what I am talking about. I'll post some more if I can find them. It's often hard to hear on videos over the exhaust.

It starts on this one around the 14 sec mark and you can hear it faintly until he slows down the first time. Then skip to the end where he goes WOT and you can hear it for about five secs starting at 1:55.

http://www.youtube.com/watch?v=eHjBUlMW-7E

gusman 02-15-2012 11:39 AM

my 01 4.7 dakota had it too... no idea what it is

starquestbd22 02-15-2012 02:31 PM

It's funny because I don't get on my truck hard enough to hear it often but whenever I do it is very noticeable. I don't mind because it really does sound a LOT like a cog-driven supercharger. But I have looked thoroughly and have yet to find a supercharger anywhere under my hood.
:LOL:

especlipse 02-24-2012 03:02 PM

Sounds like rear diff. My 2010 1500 had the same noise. Took to dealer and they replaced ring and pinion gear set under warranty.
http://ramforumz.com/showthread.php?t=102243

Maddevill 02-24-2012 03:16 PM

A little wine...
 
Mine usually comes from my kids in the back seat....:gy:

starquestbd22 02-25-2012 03:19 AM

Quote:

Originally Posted by especlipse (Post 732401)
Sounds like rear diff. My 2010 1500 had the same noise. Took to dealer and they replaced ring and pinion gear set under warranty.
http://ramforumz.com/showthread.php?t=102243

Anything is possible but I don't think it is the rear end. I'm 95% certain it's coming from under the hood.

Quote:

Originally Posted by Maddevill (Post 732408)
Mine usually comes from my kids in the back seat....:gy:

Lol, I know that feeling. The 3 year old does the whining in the back of my Ram....when she isn't talking or singing that is. The 13 year old usually sounds of a dinging cell phone and the occasional fart!!

C0DRAM04 02-26-2012 11:31 AM

IMO I think it is in the air induction, I put my CAI on and the sound fainted a little bit. The sound was a lot louder with the stock induction box. I love the sound though, sounds like a supercharger whine!!


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