Ok guru's, I got a good one. Have an 02 spi with auto trans. While driving the trans will shift itself out of overdrive and a few seconds to a few minuets later it will shift back into o/d. I've heard much talk about the "A" solenoid but no trouble codes come up to indicate a problem. This has happened about a year ago and took it to AAMCO. They could find no trouble codes either and at the time it remained in o/d as normal. the manager told me to try changing thr filter and fliud which I did and it worked great. So when it happened again that was the first thing I did but this time it didn't work. It doesn't happen all the time. Sometimes while driving it just goes out of overdrive. All other gears shift normal. Even when I park the car and turn off the engine and start it up again the o/d light on the dash stays on and when I drive it won't shift into o/d, and sometimes it will go off and shift into o/d by itself. Pushing the o/d button does nothing when this happens. Wondering if the o/d switch on the shifter is bad?