I tried searching no overdrive and no over drive deville with no help.So now I ask the community. My overdrive quit working 1st thr 3rd works fine and reverse also. A few times in the past I thought I felt a slipping in overdrive but then it disappeared. As of today no overdrive at all. I suspect some type of shift solenoid or controller. All info will be appreciated thank you. If there is already a discussion on this topic please provide a link, I was unable to find one. Car is a 1996 Cadillac Deville Concours. Trans fluid is full and does not smell burnt.