[veilsidercng]

I don't know much about trannys, but I'm guessing its a automatic? It's probably something with the computer, like what tells it to shift, and when to shift..I doubt it's anything internal. With it downshifting when you slow down, it's not the brakes, it's probably whatever tells it when to shift. BUT if it shakes and stuff when you hit the brakes, and you feel it in the pedal I'd say warped rotors but you replaced them..it might just be back pressure from the engine since it downshifted. Hope you figure it out