My Venture van ran great until after the 36,000 mile warranty. I had to have the rotor's replaced. The dealer fixed at no charge since it was just over warranty.
Then I started having problems with the transmission at a little over 50,000 miles. A solenoid in the transmission had to be replaced. This was not only costly, but an inconvenience.
These problems were not cheap nor easy.
The van was well maintained.
Checks were done every 3,000 miles or as according to checklist given by Chevy.
Be glad that the solenoid was the correct repair for that condition. Many dealers will recommend a complete transmission rebuild at a cost of $2400 or much more. Anyone else who has the harsh shifting issue should research "PCS Solenoid" for the 4T65 transmission as this is a common problem that makes people think their transmission is completely shot.