Originally Posted by
amx1397
1.center bearing on drive shaft,,
2.rear spring not seated,, ( if this just started it is not the spring)
3. bent axle.
4 wheel bent
5 tire way out of round
I would go with #1
Started bout a month ago..I'm a tire tech so I know its not tire or wheel..someone said maybe a camshaft sensor???? But as I read about that it usually shuts car down which never happened..once in third gear it completely goes away.