The car has 166000 on it but the motor and transmission were completely rebuilt at 142000 so bot fairly new. Today on the way to work while driving on the freeway with no warning of anykind my transmission dropped out of overdrive (4 speed Automatic) and would not shift back in. I tried manually taking O/D on and off with switch, tried power /economy modes and no chasnge. It appears to shift up and down fine otherwise just no O/D at all. Any Ideas??