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Power Strokes
6.4 Tech
Driveline vibrations
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[QUOTE="kleake, post: 1470100, member: 25987"] New joints when they did the shaft. And yes, the flange has 0 runout. The rear portion of the shaft is cast and is the slip joint so it's impossible to check runout there. Just in front of the slip joint at the start of the tube (~12" in front of rear joint), there is a small amount of runout. I just marked the shaft as it rotated, then turned it 180 degrees on the rear flange and marked the shaft again. The marks are in exactly the same spot telling me it's the shaft. Now I have to say this one LOOKS better than the first time, but it actually has more vibration. There is about 8 marks on the shaft where he was testing the runout on his machine and it was within .008 over the full length, so nearly perfect. Starts vibrating on jack stands at 67mph, is strongest at 73mph, then tapers off a little but remains up to about 85mph where I stopped testing. There is no mistaking, it's definitely driveline vibrations for sure. Maybe it's simply out of balance even though it was checked a total of 4 times? I'm at the point that it's got to be something with his machine, but it's really odd that it is perfect on there but vibrates on the truck. I'm pulling the yoke and verifying bearings and a new seal while I'm in right now. [/QUOTE]
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