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Ok here is your fix, If you go to the dealer they sellshims that go between the trans mount and the trans to change the angle and the pitch of the driveshaft to eliminate that vibration.. good luck
A likely cause is the front tires are out of round or out of balance or both.
Tires are the most common cause of excessive vibration at highway speed assuming the hubs are good and the bearings are tight, and the front end parts are all tight and in good condition.
I just replaced 4 tires on my 1997 Cadillac Deville Limousine and it made a great difference in the ride and control, and got rid of a tire that had a 1/4" bump in it as seen by the tech that spin balanced it for me.
Try to have it balanced first, and check for out of roundness, and also inflate the tires to the max. pressure allowed by the specification as indicated by a placard on the inside of the driver's side door.
Good luck on getting rid of this vibration problem at 50 mph.
carrier bearings are in the rear differential,and when they go bad,you will have a VERY noticable grind noise come from the rear and some vibration. They are reltively easy easy to replace yourself,though a good shop will charge around $200 for parts AND labor.
Does this van have a carrier bearing in the center of the driveshaft? If it does this could be your culprit,you can tell if it has a carrier bearing by looking at the drive shaft in the middle it will around the driveshaft and bolted to floor support of the van.
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