I have an odd vibration which is causing a lot of cab noise as well.

The vibration is kinda weird because it will come and go.

The noise/vibration goes away when I push in the clutch.
So.
The only thing I can come up with is that the clutch is either out of balance, or 4th/5th gears are going in the transmission.
Some vibration is resonating in the transmission though and it's like having loud rollover in the cab.

You can feel the vibration in the t-case shifter when its bad, but when its not really there you still have the resonance of the trans, but no vibration in the t-case shifter.
When the vibration is really bad you can feel it in the floor board and in the trans shifter.

Think its possible if my clutch is out of balance that bad it could be causing this?

I'm having occasional issues where it's seeming like the clutch isn't disengaging all the way as well. Hard to get in gear.
No problems shifting afterwards.

Kinda seems like there is less chance of vibration if I shift into 5th gear at a lower RPM and Speed.

 

Loose mounts somewhere?

Maybe your engine or trans are flexing and rubbing on something or forcing your DP against the fire wall?

 

Ehh.
I can see that for the hum, but all the mount stuff is fine.

This is a vibration you can feel, down pipe isn't going to make the t-case and transmission resonate.

 

How are your u-joints? Any chance with al the axle work you have been doing that your driveline got out of phase or one of the u-joints is getting loose?

 

tranny throw out bearin or more likely input bearing. at least that is my guess.

richard

 

I would almost think it would have more to do with the slack in the slip yoke on the t-case that you told me about, rather than the clutch. I think there and the u-joints is where I'd start on this.

 

I thought that at first as well, but when I've had issues back there, there has also been vibrations no matter what is going on, acceleration, deceleration.

I had to start it cause it was so cold here today.

but got it a bit warmer and put the rpm's up.
It started to vibrate a bit around some rpm, i couldn't see the gauge. It was cold and I didn't want to be out there too long, but it seems once it gets in a certain resonance it comes in.

Any time I've checked the slip yoke since I've gotten this issue its seemed normal.
Just replaced the U-joints on them too, so I know its not the issue.

I've never had the drive shaft vibrations make the shiftier or the floor board vibrate either.



Just trying to gather some intel here before I tear into it.
I have no way at all to verify if its a drive shaft issue, but if you press in the clutch, the vibration goes away.

I'd think the vibration was more of the drive shaft too, but the feel for it is wrong. Plus the issues with the clutch not wanting to disengage while stopped.

My clutch is trashed. I'm just trying to determine if the clutch is out of balance if it would cause these issues.
Or if the vibration and hum i'm getting is from the final drive of the transmission.

 

I forgot you told me the vibration went away when you pushed the clutch in.

 

Yeah, driveline crap rarely goes away when you take stress off the driveline unless it's re-aligning itself.
There is no low end vibration though taking off.

The part that's throwing me off is there is no vibration in first though 3rd either that I can notice.

But then when I just reved the motor outside, i got a vibration out of the motor.
I think the vibration is just being made worse by the trans resonation.

I just dont understand how a clutch can get that far outa wack and still work i guess if that is the case.

It is a rotating center mass though.

 

Could be a trashed pilot bearing.

 

That was one of the things my Dad had thought of.

I guess that could throw the drive out of alignment a tad and cause some vibrations in the driveline.

 

Yep, and go away when you push the clutch in.

 

Dan said I shouldn't get a vibration from the clutch.
But then, I think, it all depends on how wasted my clutch is.

Our trucks have a different vibration than the inline 6 cumins as well.

 

I would put money on the the rear axle you just toyed with

 

Do I understand that you're feeling this vibration at times when the truck is not in motion?