Americans do change the T sounds into D sounds, they changed Trousers to Pants which means underwear in England (used to at least).
My Kids pronouce Egg as eigg (as in eight) Military as Mili-Ta-ry, and somehow Lorries turned into Truck, Car Bonnets became Hoods and Soft Drinks morphed into Soda or POp.
Guess I survived the Language shock.
But seriously I had a hard time understanding Jamaican Fastest Sprinter alive Asafa Powell, and I am good with non American English. The only people about as hard for me to understand are Liberians.