Loud with vibrations from the rear end (?) at 50 mph

[windsurfvan]

Check the drive shaft, similar thing was going on with mine before it failed. They can do lots of damage at higher speeds. I have an OEM one on a parts van still if you want to go that route. I put an aftermarket on mine for around $350 as they are more better.

Thanks for the great info amigo. I was guessing that it could be in the drive line. A mechanic pal down the street is going to drive it soon and hopefully diagnose it. I will update soon.