It started out being rough riding and was told over and over it wasn’t the transmission. Then it started doing it more often and now everytime we drive between 15-30 MPH it shakes and vibrates and makes noises then once above 30 it’s fine till we get to 60 and it’s started being rough riding again.

The van now has 54,500 miles on it. Chevy says all of the hard bumps are within parameters of a normal transmission, bull crap! They are just waiting for the warranty to wear off. I took it to another shop and he said there were no codes on his computer but there is definitely a very hard downshift between 3rd and 2nd.