2005 Honda Accord transmission problems

I own both a 2004 accord ex v6 coupe and now a 2005 ex v6 sedan with automatic transmissions. Transmission gear shifter completely misses the "d" postition and moves into "d3" when shifting from either "park or neutral modes", as though that is the correct position to operate the vehicle when driving! This is not a normal condition to operate a vehicle. There is no significant "detent" position to secure the shifter into the "d" postion. It simple slips by the "d" mode right into "d3"!

1) the vehicle shakes at high speed. 2) the vehicle at slow speed sounds like the wheel bearings are grinding themselves down 3) the vehicle vibrates at slow and high speed but more so at high speed when pressing the brake peddle 4) the vehicle was brought to the dealership 3 times for these problems with the drive train and the brakes. Still after the third time of having new brakes and wheel bearing the vehicle continues to vibrate to such a manner as I feel it highly unsafe.