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-   Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 (http://www.ramforumz.com/forumdisplay.php?f=13)
-   -   Hum when hill climbing. (http://www.ramforumz.com/showthread.php?t=57645)

GPSHSLAX 07-20-2010 11:16 PM

Hum when hill climbing.
 
I've recently noticed a slight hum when running uphill on the highway. It seems to happen only is the grade is enough (or the uphill is long enough) that I start to lose speed. I'll drop about 1mph and then I can hear a quite hum sort of like I'm running on rumble strips on the edge of the highway but barely audable. The hum will suddenly dissapear when I crest the hill. The funny thing though is that there is no change in RPM or indication that the trany is downshifting.

What is up with that?

I think I can hear it now only because of the new intake. It doesn't make the engine sound much different at highway speed really, but I seem to be able to pick out this sound now whereas before it was too muffled.

GPSHSLAX 07-23-2010 12:14 PM

Bump for my post, but additional info as well. Driving yesterday, and being hyper attentive, I noticed that at the same time as I hear the hum I can also feel a slight vibration through the floorboards. The condition causing this hasent changed, I just noticed the similtaneous vibration. Again it's not bad, barely noticable, but it's there.


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