2006 Nissan Frontier transmission problems

Dt*: the contact stated the vehicle rolled slightly backward while stopped at a light on an incline. The contact's foot was not on the brake and the transmission was in drive. The dealer was contacted and determined this was normal operation for this vehicle. However, the contact owned two other automatic transmission vehicles that did not exhibit this problem.

I have a 2006 nissan frontier. While driving down the road the truck shudders and shakes and cannot shift into gear. I had no pick up while driving on the interstate and had cars speeding by me at 75MPH while I was barely able to drive the truck. The truck would drive fine and than this would happen out of nowhere. I took it to aamco and found out I had water in the transmission due to a leak in the radiator. I had to pay $2500.00 to have my transmission rebuilt and a new radiator installed.