Vibration over 40 mph.

89on35s said

No I don't. The more I figure on this, the more I convince myself it' in the driveline. I was driving it today and it was vibrating mildly at 60 mph cruise. I got the OD on switch, the rpm dropped to 2000 and the vibration stayed constant. Going to remeasure angles now. My "honey do" list is done.
Cley

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A couple of things.
No one mentioned if the car vibrates at that RPM without rolling, but from what you say in your posts I think you would realize that and what it means.
The other thing is that I paid a "race" shop to balance my driveline to the tune of 150 bucks and it was still out of balance.

I ended up wanting to prove it, so I marked the driveline in quarters on the trans end and numbered the marks 1-2-3-4.
I put a 3" hose clamp around the driveline at the trans end (because that was where it felt like it was) and aligned the screw of the clamp with line #1
Tested on stands and worked my way around the driveline to each line.

When the screw ended up on line #3 it was WAY smoother, so that not only proved it was the driveline, but proved at which end and where it was lacking balance weight.

I did move to line #4 after that but the vibration came back, so I moved it back to line #3.