Vibration

[Bud.bovee]

I have a 2007.5 quad cab long bed 3500 drw 6.7l diesel. For a few years now i have a vibration around 65mph. Ive changed the u joints. Dodge had the truck for 2 days and said it was the tires which was b.s. i had 2 sets on the truck and had the same issue. If you rotate the tires the vibration doesnt move. Its always in the rear. You always feel it in the seat. The other thing is that the vibration is not constant. Some times it is there and some time it isnt.*

Any ideas?

 

[sag2]

Center support mount weak/soft?

 

[Bud.bovee]

You talking about where the transmission bolts too?*

 

[seafish]

NO, he means the center support bearing assembly right at the middle attachment point of the TWO pieces of the rear driveshaft.

Of course if you have a ONE piece, aluminum driveshaft then his comment does not apply to your situation.

You talking about where the transmission bolts too?*

 

[KATOOM]

Would you describe the vibration as fast and harmonic like a massaging tool on your butt and feet? Or would you describe it more slower and wobbly like a washing machine during the spin cycle?
Also, if you suspect u-joints then remove the front driveshaft and see if the problem remains.

 

[Bud.bovee]

I do have a one piece drive shaft.
Its a slow hard vibration. Enough to shake the seat headrest. But it varies. Sometimes its real light. Sometimes its heavy. Sometimes its completly gone.

 

[Missouri Mule]

So your saying it vibrates sometimes at around 65 mph? If you feel on your seat it is definitely in the rear of the truck some where.
Here are some possible causes.
Undercoating or foreign material on shaft.
Loose u-joint clamp screws..
Loose or bent yoke or excessive run out.
Incorrect drive line angularity.
Rear spring center bolt not in seat.
Worn u-joint bearings
propeller (drive) shaft damaged (bent tube) or out of balance.
broken rear spring
excessive dive pinion gear shaft yoke runout.
check to see if any of the weights are missing.

Just for the heck of it look at the weights on the wheels/rims see if any of them have a lots of weights on one side.

 

[Missouri Mule]

So your saying it vibrates sometimes at around 65 mph? If you feel on your seat it is definitely in the rear of the truck some where.
Here are some possible causes.
Undercoating or foreign material on shaft.
Loose u-joint clamp screws..
Loose or bent yoke or excessive run out.
Incorrect drive line angularity.
Rear spring center bolt not in seat.
Worn u-joint bearings
propeller (drive) shaft damaged (bent tube) or out of balance.
broken rear spring
excessive dive pinion gear shaft yoke runout.
check to see if any of the weights are missing.

Just for the heck of it look to see if any of the wheels/rims have a lot of weights on one side.

 

[KATOOM]

Is there any time you can reference to when this possibly started to occur? From what you describe it kinda sounds more like its related to tires than the driveline. That said, tires can cause many different issues based on their quality, the competency of the shop who installed them, balancing issues from the shops machines, or tires that are simply out of round or separating.

For example, I chased a slow wobble shake for years. Felt like a washing machine in a high speed spin cycle. The vibration would strangely come and go depending on driving conditions and speed too. I had the tire shop balance them so many times that I got bored of taking it in. Actually they started marking the tires just to be sure they werent doing something weird like spinning on the rim. Tires looked good and seemed to balance per the machines so why replace them right.....? Well one day I just happen to notice a small edge of the casing coming loose from the tread. I took it back in and low and behold the tires were internally separating and causing all kinds of balancing issues. Four new tires and my truck never drove so smoooooth. Still have those tires too.

 

[Bud.bovee]

I hope thats not the case. I am on my second set of tires, 2 different brands, and both had the same problem.

 

[KATOOM]

Take notice of the amount of weight on the tires. If you find that its considerable (like 3 oz or more per tire) then its likely that the tires are either crappy and out of round or the installer is not so bright. I've fought tires like this and sometimes the techs can somewhat solve the issue by spinning the problem tires 180* on the rim to shift the weight.

 

[Missouri Mule]

If there a lot of weights on one sife of a tire (s) *jack the truck up so it is even side to side. For front tires put something with a straight edge/ side like cardboard box or tool box and spin the tire slowly . Watch the tire and the box. *You can do the same with the back tires just put the box behind them.
A roving tire man showed me this trick.
If the tire is out of round or has flat spot or just deffective the tire tread wiill be close to the box then there will be a larger gap. *He found a bad tire on my liner doing this. *5 years a go when put a new set I new had a bad one,saw one tire weighted on one side. Jacked Mule up . Put a milk crate by the tread the tire would be 1/8 inch away then it went to 1/2 or more for 25 to 33 percent of the tire. Took it back and got a new one.

 

[cerberusiam]

I do have a one piece drive shaft.
Its a slow hard vibration. Enough to shake the seat headrest. But it varies. Sometimes its real light. Sometimes its heavy. Sometimes its completly gone.

Check your rear diff and see if there is any sign of oil leakage from the seal. If there is you found the problem, the flange is out of center. You might try flipping the flange mount 180 degrees and see if that changes or effects anything.

What transmission do you have? Some more info on the truck and configuration with nay mods like the 1 piece DS will help. If you have a manual trans the DMF might be tango uniform unless it has been changed. The autos were not as prone to vibes but it is possible the TC has failed or something internal is going.

 

[Bud.bovee]

Thank you all for your input. My transmission got rebuilt to a stage 3 about 4 months ago. I had this problem way before this. I have no leaks in the rear end. I am rotating the tires today so i will try out that rotating trick and see what it looks like.

 

[Bud.bovee]

Did the rotation trick. Tires looked perfect

 

[KATOOM]

Did the rotation trick. Tires looked perfect

Meaning it solved the vibration?