Car shifting extremely hard on Chevrolet Monte Carlo

Average mileage: 110,533 (32,500–160,000)
Engines affected: 3.4L V6, 3.5L V6, 3.8L V6, 3.8L V6 Supercharged, 3.9L V6
4 model years affected: 2003, 2004, 2005, 2006
6 people reported this problem
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problem details
2006 Chevrolet Monte Carlo - 3.5L V6 160,000 mi,
My car jerk when coming out Ida stop when I accelerate.
2006 Chevrolet Monte Carlo - 3.9L V6 32,500 mi,
Same problem
2005 Chevrolet Monte Carlo - 3.8L V6 126,000 mi,
Transmission may CLUNK loudly at takeoff from stop. Feels like a slipping band did in older transmissions. Sometimes, shifting from second, it make a slip.
2005 Chevrolet Monte Carlo - 3.8L V6 Supercharged 118,000 mi,
2005 Monte Carlo shifting extremely hard on initial takeoff from a complete stop. About every 3-4 weeks car jerks violently forward. Once out of first gear, the car runs smoothly. Took the car to a Chevy dealership who was able to duplicate the issue and confirmed problem with the valve body. Valves, gaskets and selenoid replaced at a whopping $1400. No other major mechanical issues with the vehicle, I'm the original owner and car is maintained in exceptional condition.