drove the truck last week on a trip across the state. Passed a 6.7 PSD
truck doing 50 MPH in a 55 MPH, got up to about 70 MPH, and heard a sound, like a piece of metal hitting something. Hmm. Didn't notice anything at that time, but when I got on the expressway I definitely had a significant vibration starting at about 70 MPH and above.
It definitely feels like a driveshaft (or related) vibration to me, based on the frequency (much too high to be a tire or something of the sorts). Dependent on vehicle speed only, not engine speed or percent right pedal.
I was hoping it was a U-joint or a support bearing, so I pulled the driveshaft. No such luck. All joints and bearing feel like new. They appear to be original joints, and I was kind of shocked they felt like they did being 17 years and 196k miles old.
I did notice a place on the forward section that sure looks like something was attached and is no longer attached.
I'm not used to seeing balancing weights attached in the middle of a shaft, and the shaft still has weights attached at the ends. Could have this been possibly a metal tag? Or additional weights? I wish I would have looked at the shaft beforehand, but hindsight is 20/20. Has anyone else seen something attached to the shaft at this location (pictures)? If there was something there, it flying off at 70 MPH would sure explain the noise I heard.
As of now my plan is to take the shaft to a driveline shop and see what they can do with it, unless anyone has a better suggestion?
Sometimes it gets old every time I drive my truck I become aware of something else that needs attention. Ah, I still enjoy this thing though