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1998 E-350 Winnebago Class C, one piece driveshaft, V10, E4OD, 50,000 miles, no codes.
I have been fighting a driveline vibration for some time, have had the driveshaft re-balanced, new u-joints, slip yoke some wear but not bad.
When you apply power or coast, nothing but when you hold the throttle steady over 50 mph it sounds and feels like you wondered over on the rumble strip on most interstate highways.
Any suggestions!
It wound up being old transmission fluid (although it was red, clear with no burnt smell, it did have 50K on it) causing torque converter flutter. Had it flushed and refilled with synthetic and the vibration seems to be gone.