Anyone experience a drivetrain vibration from 40-75+ MPH. Can feel this under a load or straight & level w/cruise control on. It feels the same as my '72 Impala did when the u-joint went out.

So far, the wheels were road-force balanced & rotated, upper LH control arm replaced, and both lower ball joints replaced.

The car has 33K on it and otherwise in perfect condition. I can feel the vibration on the floorboard, gas pedal and steering wheel a little. Thanks in advance for the help. -Mike