how much HP are you running thru it?

 

My 06 RC 4x4 vibrated at exactly 70 mph. I brang it in and thay replaced the driveshaft. Now it vibrates at 55. I hate to bring it in again, but maybe when i get my leaky injecter pump fixed ill have them look at it.

 

I would say somewhere around 425 to 450hp. Thats based on a dyno run my friend did on his truck that has the exact same mods I do. I was in four inch deep mud at full throttle, performance setting on the BD and on a moderate incline getting back to an oil rig. First time in 22 years a truck has made me call for a tow.

 

John Holmes, the tech guru at www.carsondodge.com says it's because of the hydroformed chassis. They have a sticky on their forum that lists the top ten fixes they found to correct the problem.

Pete

 

Endured the 70-75MPH vibration for 92000 miles. The replacement power steering hose helped some. Wasn't until I replaced the Michelin tires with TOYO's that I got rid of the vibration completely. Even though tires were listed as a possible cause, I was a non-believer. Until now

 

Guess I'll chime in with my '04 QC 4x4 CTD SWB nightmare too...

I have the dreaded whaaa whaaa whaaa harmonic at 68-72 MPH. I just picked my truck up from the dealership about an hour ago. It's been in there since Monday, initially for a blown pinion seal that was slinging diff oil all over the underside of the truck. I told them the tranny (or something) was leaking as it was dripping right at the bottom of the bellhousing where the tranny bolts to the engine. They said they didn't see anyhting (of course not, I climbed under it and it's apparent someone has wiped it clean)...I'll keep an eye on that.

Anyway, the seal was fixed by tueday afternoon, the rest of the week was spent trying to fix the harmonic buzz and noise. I even had to go down there and take several of them for a drive to show them what I was talking about (they all agree it is there), they just can't figure out how to fix it.

I picked the truck up to take home for the weekend (and holiday Monday) because I can't afford to pay for the **** rental car to just sit in the driveway all weekend.

I am supposed to take it back Tuesday for them to continue their work...debating that as I can't afford another $225 to rent a POS Chevy Kobalt for another week.

My truck has 49,000 miles on it. I guess I could try the shaft indexing myself and see what that does. The truck did not have this vibration when I bought it new in '04. It's something that has developed over time. If the shaft indexing doesn't do it, then I dunno what I will do because in addition to the harmonic, the steering is getting bad. Lots of play in the steering (and I understand why...because of the cheap inverted Y steering setup with ball joints, etc)...I could pay $700+ out of my pocket for a Thuren track bar and crossover steering setup and that WILL fix it, but ****...49K miles and the steering is shot..GULP!

It's kind of a love/hate thing for me right now. I love the looks of the truck, I love the Cummins, but hating the poor quality of a supposed "heavy duty" truck that's requiring time and money just to keep it usable and with so few miles and no "heavy duty" use of it since new.

I know with a lot of money and aftermarket parts, it'd be awesome (but that's true for any truck).

That lemon law thing is starting to sound good.

 

I look at the dodge cummins truck like a can of beer. I bought it because of whats inside thats good - the motor. Everything else is S*!%.

 

As of right now, is there a TSB that anybody knows of..i checked around and came up empty..
thanks in advance.
bringing in the beast tomorrow to get some other crap looked at...

 

I have the same problem, 70 to 80 then it's gone. I've read this whole thread and it seems to me that we're all just gonna have to eat the vibration to keep the cummins. This is my first diesel, 21yrs old, I'll never buy another gasser!

 

I had an early vibration which woundup being a rear shaft u joint. Now I have a front end vibe from 60-70 and 75 and up. It goes a way w/o the shaft and when I got a new shaft made($382) the vibration got worse. The driveline shop balanced my old shaft first and didn't like the idea of making a new one because he didn't think the old one was that bad. I am going to the dealership in 2 weeks after my comp season is over. Untill then I am driving w/o my front shaft and it is fine except for no 4wd

 

I have noticed when towing,
the vibration is not as bad
the vibration gets a little worse under load on a hill as opposed to flat land



My trailer is 14K gooseneck with lots of tongue weight 3500# or so when I checked weights on a truck scale. I don't have airbags and my truck squats about 4" down and sits well into the overloads. After all the reading I have done this morning I am wondering if it is pinion angle changing under load conditions. I did not have this vibration before I had my front pinion seal replaced last year.I am just thinking out loud and trying to possibly help some other people as well.

 

I got an 04 3500 with same noise and at first I though it was the rear axle, I was planning on going back to 373 gears so I decided to rebuild both front and rear axles but after all that the noise still there it's enough to drive me crazy. I have done the following remove front driveline, replace ujoints, balanced rear driveline, replaced the bushing on the tail shaft of the transfercase, bough new tires, balanced the couple of times had them rotated and the vibration still there just after 65 mph. I just about given up can anyone help thanks.

 

Did anyone have any luck figuring this out? I have been chasing this same issue forever now!

 

Mine wound up being a bad bearing in the transfer case.

 

How did you determine the bearing in the transfer case was bad?