Vibration in front of vehicle during acceleration only, worse approaching 60mph. on 2000 Volvo V70

Symptoms: Initially felt like a bad ball joint - like the wheel was bouncing around at 60-65mph. However, as soon as there was neutral or negative load on the drive train the vibration ceased entirely. Over 70mph the vibration became somewhat dampened. The vibration has now become worse over the last several days and feels this way at all times above 20mph through acceleration. The car coasts perfectly with neutral load. However, has started vibrating with the negative load of deceleration. This is not a wheel bearing. This is not a suspension issue(checked all linkage, alignment, tire balance). I have checked the motor and transmission mounts and they seem fine. The frequency of the vibration bears no relationship to tire rotation or engine RPM. I've run it through all gears. Shifting is smooth. Frequency seems very constant without regard to speed or rpm. This is felt through the vehicle chassis, not the steering wheel. Feels possibly stronger in passenger seat than driver's but only by a small percentage. Seems to come from center to center-right of engine compartment. For perspective: The vibration is no longer subtle. If this vibration were due to a bad ball joint, it would be a very bad, dangerous situation. Car shows no diagnostic codes. Suspect transmission, perhaps a shaft bearing.

by in Rochester, NY on March 06, 2014
2 answers 4 comments
ANSWER by on March 06, 2014
How about the front drive shafts ??
COMMENT by on March 07, 2014
How about them? I don't know anything about them. Short of disassembling them what am I looking for?
ANSWER by on March 06, 2014
If awd,, rear driveshaft support bearing needs to be checked out as well as the entire shaft assembly.
COMMENT by on March 07, 2014
Vehicle is FWD not AWD or RWD. Transverse mounted engine, transmission.
COMMENT by on March 07, 2014
Yeah i know the setup but there is a awd version!! No way to tell from the limited information!! No ideas!!!
COMMENT by on March 07, 2014
Questions? I provided the information I had but I may be missing something.

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