Got my 1st Toyota Tacoma, 4x4, auto trans. a month ago and lately have noticed as I drive down a hill or hit the brake pedal it sometimes downshifts to what seems to me 1st or 2nd gear. It doesnt seem smooth to me. I do have it in D for drive not any of the other numbered gears. I may not be used to it and maybe this is what it is suppose to do but since it is my 1st Toyota I figured I would ask.