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  #41  
Old 02-25-2014, 07:33 PM
The Crow 1994 The Crow 1994 is offline
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Quote:
Originally Posted by Thunderhorse View Post
It may be your MDS, because the exhaust note changes when that comes on. If you apply just a tiny bit more gas does it stop?

Also, Ford has cylinder deactivation?
If it only happens around the 2000 RPM, I think he's experiencing what my truck is doing, too. My truck does it when it's not an optimal time for the MDS to be active.
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  #42  
Old 02-25-2014, 08:41 PM
Hydrocarbon Hydrocarbon is offline
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I think the original poster nailed it; torsional vibration. I also think that MDS vibration is confusing the issue here. Here's my experience with my Ram, a 2013 5.7L 6spd with 600 miles on it.

I have a vibration from around 1800-2050. I have to "step on it" to maybe 25-30% throttle to get the RPMs up there in both first and second gear on level ground, but feel this vibration in both gears. Therefore, it's less likely to be driveshaft; the vibration feels the same in 1st of 2nd gear at those RPMs. I feel this vibration in the pedal mostly, barely in the steering wheel, and not at all in my seat. I doubt passengers would even notice it, but then I've never been a passenger yet.

The MDS also causes vibration for me. I know it is MDS because I hear the exhaust note start to sound "rough" to me, less "smooth" then the nice V8 sound, and this sound change only happens if I'm only trying to maintain speed, not accelerate. As soon as I accelerate even moderately, the rough sound goes away, and the V8 smooth sound comes back right away. The MDS also causes minor vibration that I can feel through the pedal, but it is less consistent and less noticeable than the 2000 RPM vibration.

I wonder if the weight placed somewhere on the exhaust would take care of this like the original post links to. I just may try it if it starts to bother me. I also wonder if some Hemis really don't have this or some owners just don't notice it; my guess is the former since we had members go looking for it and didn't feel it, unless they have numb feet!
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  #43  
Old 02-27-2014, 08:40 AM
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RocketFoot RocketFoot is offline
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Yes, I can differentiate between the normal MDS vibration vs the 2000 RPM vibration. They are distinctly different.
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  #44  
Old 02-27-2014, 03:26 PM
14bluelaramie 14bluelaramie is offline
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Quote:
Originally Posted by RocketFoot View Post
Yes, I can differentiate between the normal MDS vibration vs the 2000 RPM vibration. They are distinctly different.
I get the same vibration at 2000 rpms. I have the 3.92 and my rpms spend a lot of time at 2000 rpm. from a start I speed past 2000 to 2300 and when it shifts the rpms hang in at 2000 and there is a vibration. does same with all gears. also, the exhaust is not smooth when I am going 25 mph in 6th gear. I didn't realize the MDS would kick in so slow of a speed. when it does this I give it throttle and it kicks MDS out and exhaust is smooth.
I am also from S.W. PA and could use some help with this matter. my ram has 1000 miles on it and has been doing this since I got it.
I called the dealer and he told me that they had a ram in last week that did the same and they determined it was the characteristic of the truck. I am not buying it. I want it fixed.
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  #45  
Old 02-27-2014, 04:57 PM
Hydrocarbon Hydrocarbon is offline
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Quote:
Originally Posted by RocketFoot View Post
I can believe it being a harmonic vibration but wouldn't it do it even in park or neutral?
Yes that is strange it doesn't happen when in neutral at 2000 RPM if it is torsional vibration from the engine; that's how mine is too. Maybe it's because there's no load and the combustion force is not enough. If this is the case, there should be no vibration when holding in a gear, say first or second at 2000 rpm, level ground, just maintaining speed. This should tell us if it's engine or drive train, right? I will try when I get a chance and report back.
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  #46  
Old 02-27-2014, 08:41 PM
Tom-G Tom-G is offline
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In park & neutral, the torque converter clutch is not engaged. That's why there isn't the 2000 RPM vibration in those modes. There is only a few forum members reporting this 2000 rpm vibration. If it was engine torsional vibration, I'd expect all of the Hemi Rams would have the vibration.

Any dealership that states the 2000 rpm vibration is a characteristic of these trucks needs to be informed that it is a characteristic of a defective torque converter. You need to convince your dealership service rep to call it into the Ram factory support center. Hopefully, with enough calls Ram will start authorizing repairs. For those members in Canada, it's my understanding that Ram Canada has in the past authorized torque converter and flex plate warranty replacements on the 2013s. There isn't a TSB on this in Canada, basically the dealership needs to identify the problems as a defective torque converter, and follow their normal warranty authorization procedure. I do not know if anything changed on this in Canada recently, as in the US Ram has acknowledged the 2,000 rpm vibration issue but has not authorized any repairs, nor will they confirm the root cause of the vibration. However, the TC replacements in Canada have resolved the vibration.

I don't work for Chrysler, but the information above is what I have gathered over the past several months. If anyone on the forum has any information on Ram's status as to authorizing repairs, issuing a TSB, etc.. please lets us know. Thanks.

Last edited by Tom-G; 02-27-2014 at 08:46 PM.
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  #47  
Old 02-28-2014, 08:48 AM
Hydrocarbon Hydrocarbon is offline
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Default 2000 RPM vibration possible fix

I had my truck in to get the brakes checked yesterday. They flashed the PCM at the same time. It changed the way the truck drives with crisper shifts and shifting sooner (cruising at 25 mph at well under 1000 rpm never happened before) and 2000 RPM vibration is GONE. There is none there whatsoever. Hopefully it stays gone. How is this possible? For reference, I have a 6 spd manufactured in June 2013.
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  #48  
Old 02-28-2014, 10:45 AM
The Crow 1994 The Crow 1994 is offline
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Quote:
Originally Posted by Hydrocarbon View Post
I had my truck in to get the brakes checked yesterday. They flashed the PCM at the same time. It changed the way the truck drives with crisper shifts and shifting sooner (cruising at 25 mph at well under 1000 rpm never happened before) and 2000 RPM vibration is GONE. There is none there whatsoever. Hopefully it stays gone. How is this possible? For reference, I have a 6 spd manufactured in June 2013.
That's great to hear your truck's vibration is gone. Hopefully, it stays that way for you. I have the vibration (since I took delivery) at 2000 RPM's, but my truck is an 8 speed, manufactured in May 2013. I haven't contacted my dealership yet, but I will soon just so they'll have record of the issue in my file.
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  #49  
Old 02-28-2014, 03:17 PM
Tom-G Tom-G is offline
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Quote:
Originally Posted by The Crow 1994 View Post
That's great to hear your truck's vibration is gone. Hopefully, it stays that way for you. I have the vibration (since I took delivery) at 2000 RPM's, but my truck is an 8 speed, manufactured in May 2013. I haven't contacted my dealership yet, but I will soon just so they'll have record of the issue in my file.
Yes, I agree, good news. Sounds like the engineers coded around the problem bypassing the need to replace parts. Mine is also an 8 speed. Ram issued a driveability TSB this week. I don't have any details on it but I wonder if that is the one that addresses the 2000 rpm vibration. If so, I expect my dealership to contact me soon to have the fix applied. (I'm on their list for when a fix is released).
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  #50  
Old 02-28-2014, 06:07 PM
14bluelaramie 14bluelaramie is offline
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I had my girls car today, my 2014 ram was home.so I went to a dodge dealer. I was checking out the ram 1500 on the lot and the salesman came out and I played dumb like I still had my ecoboost f150. so we went for a drive for about 20 minutes, I drove and there was NO 2000 rpm vibration. i guess this truck has no character!!! also i said to salesman that i read where some rams have a 2000 rpm vibration and he said he has heard of it and they called Chrysler and Chrysler told the dealer that it was normal.
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