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  #101  
Old 07-06-2014, 08:37 AM
Redfour5 Redfour5 is offline
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I think you are probably the closest on this lloydjacobson. Experiencing it periodically and noting the cold weather correlation, I'm thinking it is a simple "Harmonic Resonance" with essentially, and unintentionally, the vehicle resonating at that rpm. When everything is warm particularly the rubber parts between metal parts being all soft and squishy relatively speaking, it is dampened. The colder you get, the less squishy (technical term) and the more the vibrations is transmitted to where you can feel it. And due to the nature of a vehicle and rpm moving up and down intrinsically transient unless it is right at the sweet spot for highway driving and this one is close and could be vehicle specific as in mine might not do it, but yours might as the "exact" rpm for each vehicle would not be the same. Try to chase that down as an engineer. Increase highway rpm even just a bit and it might go away along with some mpg. Even changing that harmonic thing might work for only a bit as systems tend to move toward the harmony (for the system, not you) and not away as I remember. This is all just pure speculation.

Wikipedia - "Sympathetic resonance or sympathetic vibration is a harmonic phenomenon wherein a formerly passive string or vibratory body responds to external vibrations to which it has a harmonic likeness."

Quote:
Originally Posted by lloydjacobson View Post
Hi All,

After re-reading some of the other posts I'm thinking about tossing the idea from the Chrysler Engineer as exhaust drone. I'm going with 2 ideas... Harmonic balancer or transmission vibration. My reasoning is that the vibration is prominent on the steering wheel and gas pedal. Someone said they changed out the harmonic balancer which resolved their issue. Since the harmonic balancer is made of rubber and metal, temperature can easily affect the characteristics and not eliminate certain vibrations that are naturally caused by the engine. OR the vibration is coming from the torque converter and the rubber isolators and dampers are less effective during cold weather.

If the person who changed out there harmonic balancer reads this please reply or send me a private message.

If anyone has more information about the torque convertor please reply or send me a private message.
Lloyd
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  #102  
Old 07-06-2014, 09:09 AM
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Gantman Gantman is offline
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I would suggest to everyone who is experiencing this vibration to possibly give TransEngineer a message. He is my first choice for driveline questions when it comes to our Rams, whether 45, 545, 65, or 8HP70's.
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  #103  
Old 07-24-2014, 07:21 PM
14bluelaramie 14bluelaramie is offline
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i had the 2000 rpm vibration when i bought my truck feb 1st. it lasted til it got warm and now is not as pronounced. but we still have some cold mornings in Pittsburgh area and i can feel that the 2000 rpm vibration is there just waiting for the cold weather to bother the grap out of me.
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  #104  
Old 07-24-2014, 10:59 PM
Tom-G Tom-G is offline
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Has anyone had their 2,000 RPM vibration fixed? If so, please provide details. Thanks.
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  #105  
Old 07-29-2014, 02:20 PM
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Mine still does it at all temperatures but right in the 1800-2100 RPM range. Still not a critical issue for me but does get annoying when I think about! LOL
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  #106  
Old 07-29-2014, 07:47 PM
Tom-G Tom-G is offline
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The Star center had my dealership check the flex plate for a crack and also to make sure the flex plate bolts were properly torqued. Mind were fine so no fix preformed. Still have the 2000 RPM vibration. I'm concerned about it causing internal damage over the long term, so while it is very annoying, Ram needs to find the root cause and provide a fix.
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