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Typically, you can drive through unbalance problems (tires, driveshafts) - the vibration peaks at some speed and then diminishes as you go faster.
Out-of-roundness (bent wheels, failed belts on tires) will have harshness at all speeds due to the dimensional irregularity. Balancing will help but won't make the problem go away.
Bum U-joints and CV joints almost always make the most noise when the vehicle starts up from at-rest or reverses direction, due to flexibility (compliant engine, tranny mounts and suspension bushings) in the drive line.
Front-end vibrations usually are pronounced in the steering wheel. Rear-end vibrations are usually felt strongly in the seat.
If you had the driveshaft out for any service lately, perhaps you separated the two halves? The DS is balanced as an assembly, and there is an alignment mark near the center joint on each half - looks like a thin arrow, and it might be hard to see due to road grime. If you're off even one or two splines when reassembling the two halves, you will be guaranteed to get the Magic Fingers massage through your seat. Less likely but still possible is that the balance weight (usually a postage-stamp sized piece of sheet metal tack-welded to one of the shafts) got knocked off, in which case you'll need to get your DS re-balanced.
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Thank goodness we don't get all the government we pay for. -- Wiley Post
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