Hi All,
Sorry for the late reply but I think I have a pretty good idea what is happening with the 2000RPM vibration issue. I want to be clear that this is NOT related to speed of the vehicle. It's purely RPMs and how much load is on the engine. The people with this issue know what I am talking about. When your truck reaches 1800-2000 RPM you can feel a vibration in the steering wheel and gas pedal regardless of what gear or towing mode.
So I brought my truck to the dealership regarding my issue and the service techs honestly didn't even look into the issue. I got the run around. I complained to the service manager and he said there is a Chrysler field engineer that will be in the area within a day or two and if I can bring it then. I said absolutely. I met with the field engineer and he drove my truck and he said its exhaust drone. I asked why didn't I feel this when I bought the truck? He didn't have an answer. My issue was getting worse as time went by. He said drive my truck which was the same year. I could feel the same vibration but it was much much lighter and barely noticeable compared to my truck. The field engineer said this is the characteristic of the truck. There was nothing more that he could do and I felt a little blown off. Nothing was resolved.
I did a LOT of research about exhaust drone when I got home. Surprisingly most people experience exhaust drone around 2000rpms with V8's. When I think of exhaust drone I think and audible sound resonating in the cab. Well that can be transmitted differently depending on the style/build of the vehicle. So maybe I was onto something here.
As we approached spring/summer time I noticed the vibration getting lighter and lighter. Of course there is the ah-ha moment. I purchased my truck at the end of May 2013. At that time the weather was extremely warm. I didn't notice a thing until about November/December of 2013. As the weather got colder and colder it got worse. At that time I didn't think about temperature as a factor as the issue was just getting worse. I brought my truck to the dealer near the end of March when the temperature was warmer but still cold. The vibration wasn't at its worst and maybe the field engineer didn't think it was a huge concern because it wasn't really that bad that day. Now that summer is here my vibration is virtually gone. Now that I'm more "in tune" with my truck I can CLEARLY feel the vibration get worse even with slight temperature changes. With temperatures 70 degrees and up it's virtually gone but ever so slightly noticeable but nothing to complain about. Around 50-60 degree it is noticeable to me now but nothing that I would complain about IF I didn't notice it before. 20-40 it's definitely noticeable. 20 degrees and below it's extremely noticeable. And with this extremely cold winter it was very annoying. Annoying to the point that I don't want the vehicle if it continues like this.
My best guess to what the issue is are the rubber exhaust isolators, frame dampers, or the harmonic balancer. All of these items and their dampening properties would change based on the outside temperature. And I can easily see how a bad batch of these items could easily pass inspection at normal room temperature.
I haven't talked to the dealer about my findings yet but after writing this email I am now motivated again to talk to the dealer. I don't know about the rest of the people out there but talking to the dealers is like talking to a wall. I don't quite understand their lack of wiliness to help people when they spend $40,000+ on a vehicle with a very annoying problem.
I'll let you know how round three goes with the dealer. If anyone else has something to add please do! This will help me and others solve our issues!
Thanks,
Lloyd