2000 RPM vibration

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chrisbh17

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2017 Big Horn QC, 5.7L Hemi - At about 2000 RPM Im getting a vibration that is most felt through the floorboard. Not so much in the steering wheel or gas pedal.

Its not gear or speed dependent, always at around 2K RPM and only for +/- 100 RPM or so. Outside of that range its smooth. I can KIND of feel it with the truck in park or neutral, if you rev smoothly off idle to something past 2K RPM you can barely feel a bit of vibration around the same range.

Ideas? I know lots of people have mentioned harmonics and I tend to agree, but there are lots of people that DON'T have the vibration either.

Truck is under warranty but I haven't mentioned it to my dealer yet (can't give up the truck for a possibly extended period)

Thanks in advance.

-Chris
 

noclass

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Could be anything that is moving at engine speed. Belt,accessories,torque converter ect.
 

TRCM

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Could be anything that is moving at engine speed. Belt,accessories,torque converter ect.


Most accessories don't spin at the same rpm as the engine anyway. Their speed vaires by the size of the pulley installed on them.

It could be just about anything moving at any rpm at that torque level, or anything that happens to vibrate at that given engine rpm (like motor mounts).
 
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GsRAM

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Most accessories don't spin at the same rpm as the engine anyway. Their speed vaires by the size of the pulley installed on them.

It could be just about anything moving at any rpm at that torque level, or anything that happens to vibrate at that given engine rpm (like motor mounts).

You read my mind. Motor mounts comes to mind with what is being described. Beyond that, torque converter, body mounts? How many miles are on it?
 
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chrisbh17

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Thanks everyone.

Truck only has 1000 miles on it. Pretty sure the vibration wasnt there when I first got the truck. Over at "that other forum" there are quite a few people that have it and have noticed it's more prevalent during colder weather... And it's getting colder here, so it's possible I just didn't notice it until now.

I can sort of feel it while in park so I figure that rules out the torque converter. Also, if it was torque converter, would it do it at different RPMs in each gear? I literally only feel it for 200 RPM or so, in any gear (Ive used the Gear +/- button to hold it in each gear and confirm the RPMs it occurs at in each separate gear)

Some people have even had the torque converter replaced but the vibration remained. Harmonics seems to be a big possibility, of motor mounts as mentioned.... Possibly The way they mount the engine and differential to the same point using the same bracket. Or maybe exhaust. Or maybe harmonic balancer on the engine not doing its job perfectly.

I think I'm going to wait it out until my oil change (freebie from dealer) and will mention it to them when I bring the truck in.

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TRCM

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Thanks everyone.

Truck only has 1000 miles on it. Pretty sure the vibration wasnt there when I first got the truck. Over at "that other forum" there are quite a few people that have it and have noticed it's more prevalent during colder weather... And it's getting colder here, so it's possible I just didn't notice it until now.

I can sort of feel it while in park so I figure that rules out the torque converter. Also, if it was torque converter, would it do it at different RPMs in each gear? I literally only feel it for 200 RPM or so, in any gear (Ive used the Gear +/- button to hold it in each gear and confirm the RPMs it occurs at in each separate gear)

Some people have even had the torque converter replaced but the vibration remained. Harmonics seems to be a big possibility, of motor mounts as mentioned.... Possibly The way they mount the engine and differential to the same point using the same bracket. Or maybe exhaust. Or maybe harmonic balancer on the engine not doing its job perfectly.

I think I'm going to wait it out until my oil change (freebie from dealer) and will mention it to them when I bring the truck in.

Sent from my Nexus 6P using Tapatalk

Why does feeling it in park rule out the torque converter ?...it is still spinning at the same speed as the engine. May not have as much load on it, but it is still spinning the same speed.
 
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chrisbh17

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Why does feeling it in park rule out the torque converter ?...it is still spinning at the same speed as the engine. May not have as much load on it, but it is still spinning the same speed.

Wasnt sure if it was somehow disconnected from the works when in park or neutral. So TC cant be ruled out either...will see what the dealer comes up with

On the net Ive seen anything from full trans. replacement, to TC only replacement, to "its a characteristic of the engine". Oddly enough, the full trans and/or tc replacements didnt necessarily fix the issue.
 
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chrisbh17

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FYI I setup an appointment with service next Tuesday. They noted they will have the shop foreman or tech come with me to re-create the vibration

Not sure they will even have a fix but I at least want it noted in my service history in case it becomes a bigger issue in the future.
 

RamCares

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FYI I setup an appointment with service next Tuesday. They noted they will have the shop foreman or tech come with me to re-create the vibration

Not sure they will even have a fix but I at least want it noted in my service history in case it becomes a bigger issue in the future.

Hi chrisbh17

If you need assistance during your appointment please send us a PM with your VIN and let me know!

Andrea
Ram Social Care Specialist
 
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chrisbh17

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Hi chrisbh17

If you need assistance during your appointment please send us a PM with your VIN and let me know!

Andrea
Ram Social Care Specialist

Thanks, Andrea!

Will send you a PM.

-Chris
 
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chrisbh17

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Update:

Had the shop foreman go for a ride with me on Tuesday. I drove first then he drove.

Luckily I could re-create the issue. When I drove it he could kind of feel it in the passenger floorboard, but not as much as when he drove it. Said he felt it right away but wasn't sure what he could do to fix it.

Got back to dealer and he checked STAR cases and TSBs and there were none related. Then pulled a 167 mile old 2017 off the lot and we drove it....same issue immediately. So "normal characteristic". They did note it in my file that I wasnt exactly thrilled with the diagnosis.

Here I am a few days later and Im still a little irked with it. Im most worried that its a transmission issue but Im not sure how to verify. Wondering if I should call my dealer again, or maybe even try another?
 

Kap1

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Same exact issue here with my 70k miles 2013 1500. Only that mine vibrates a little bit while on Reverse gear trying to slowly back out of parking spot while holding break pedal a little bit.

This never happened before to my truck until dealer did exhaust manifold bolts repair last month. They had to send it to machine shop as they broke off one of the bolts.

What could they have done during manifold repair that caused vibration to appear?


I mentioned it to service advisor but he pretended like he didn't hear me, of course I was taking truck back in for cylinder misfire which is more critical that slight vibration.
 
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chrisbh17

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Left the truck at dealer #2. They let me drive it with them and then the service guy drove it himself.

Already getting the bs about "we'll check the computer for STAR cases and updates" then after they found none I got the "well if you can leave the truck we'll drive a few others to see if they are the same"

So basically they are priming me for the whole "normal characteristic" argument.

Seriously considering getting rid of the truck, for 2 reasons:

1. I dont call it normal. I did not see the "2000 rpm vibration" option listed on my window sticker. AND it gets worse in 4WD-Auto, so something is definitely going on.

2. RAM dealers "service" so far has consisted of spending a few minutes looking at the computer, a few more minutes finding one that does it and then sending me on my way. What kind of "service" is that? No one has actually looked at my actual truck to see if anything might be wrong with it. What happens if I ever actually need REAL service? Just wait until the warranty expires so I can start paying people to fix it?
 
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chrisbh17

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UPDATE:

Confirmed "normal characteristic" diagnosis.

I drove one of the trucks they drove that had the same issue. It did not have the 44-44 xfer case like mine, but did have the hemi. And sure enough, 2K RPM there is a vibration. I couldnt test to make sure its worse in 4wd since there is no 4-auto and our roads are not slick.

They DID agree that mine IS worse when set to 4-auto and went on to explain that away by the fact that some torque does get transferred to the front wheels even without the rears slipping. Thats news to me, I thought 4-auto was RWD until the rear wheels slipped, but OK.

They didnt seem to think that was a clue to look anywhere. But they did also confirm that they at least looked the truck over while it was on the lift (which is more than what dealer #1 did).

I relayed my disappointment to RAM Cares, because if this is normal for all of their 1500's, Im surprised they sell any of them. Also mentioned how Im seriously considering getting rid of my 1400 mile old truck for one that doesnt have vibration (and one that gets worse in 4wd) as a normal characteristic. My 16 year old Nissan Frontier felt almost exactly the same in 4WD as it did in 2WD....why does my 3 month old RAM feel worse?
 

huntergreen

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No vibe on my truck. Test drive a couple others and show them this is not a normal characteristic.
 
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chrisbh17

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I'll be trying. They have 4 or 5 more 2017s there.... Going to be a "buyer" and test drive as many of them as I can. Who knows if I find one that doesn't do it but it's the best I can do.

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Ramnewbie

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Unfortunately finding the cause of the vibration will only be accomplished by you're persistence. Years ago my dad had a dodge pickup that had a vibration. Dealer balanced the tires several times, balanced the drive shaft twice, replaced the TC, replaced rods and mains. Still had the vibration. Finally when he had gearing changed to what he wanted origanaly but couldn't order from factory it was discovered that the pinion bearing was bad. Vibration gone.

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chrisbh17

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Yeah I have ramcares involved and have made sure it's noted in my file that I don't agree with their diagnosis. I'm not sure how they can say it's normal especially when whatever it is gets worse in 4wd.

You mention persistence but I'm not quite sure what else I can do. Keep taking it to different dealers? Not convenient but I guess it's something I can try. There are a couple more near me that I haven't used.

And if I ever manage to find a truck that DOESN'T do it I'm not really sure what I would do at that point.

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Ramnewbie

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Yeah I have ramcares involved and have made sure it's noted in my file that I don't agree with their diagnosis. I'm not sure how they can say it's normal especially when whatever it is gets worse in 4wd.

You mention persistence but I'm not quite sure what else I can do. Keep taking it to different dealers? Not convenient but I guess it's something I can try. There are a couple more near me that I haven't used.

And if I ever manage to find a truck that DOESN'T do it I'm not really sure what I would do at that point.

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Yeah, it's wierd that you're vibration seems to be rpm oriented but worse in 4wd. I guess it makes sense though as it would be putting a little extra load on something that allready ain't right. Which takes you right back to where you started, TC, transmission, something on engine. It would be just too simple if it was one of the accessories on the engine, AC, alternator. Have they checked you're fan clutch and hub?

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