Q: vehicle violently shakes when you first start driving then smooths out after 5-10 miles down the road.

Hello,

I have a 1985 chevy G30 van with a mallard rv body, runs great and drives straight. I have brand new tires and breaks and have visually checked barrings every looks good, even greased all the fittings and anything else i could. when i have had the vehicle parked and shut off for more than 5-10 mins once i start driving again it will shake violently and become worst the faster i go. until about 5-10 miles down the road then she will smooth out and ride beautifully the entire time until i park again. so not sure where to start on this one was thinking maybe it could be a carrier barring or something to that extent but not sure because like i said everything looks to be in good shape. please help!!!

Sincerely Jordan

My car has 50000 miles.
My car has an automatic transmission.