[Fot] TR4 High speed driveline vibration

[toodamnfunky at comcast.net]

FoT, 
I have a driveline vibration that doesn't start up until I get to about 95- 100 MPH. I figured I would start with the driveshaft 
before looking into the diff or OD/trans. I have an IRS car with Richard Good CV axles and hubs so it's very un likely its that but 
I will inspect them. I'm wondering if anybody has any advice on high speed vibration diagnosis or detection. 
What I'm wondering is even if it is the driveshaft how would I know with it sitting on my bench. 
Any help would, as always be greatly appreciated. 
Jim g 
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