My legacy has recently began losing 3rd and 4th gears after driving beyond 20 miles or so. The ATF is good. I believe the problem is electronic and replaced the vehicle speed sensor (top passenger side of AT). The code I retrieve is for the output speed sensor circuit. (I am beginning to see my solution as I type) Has anyone else experienced this problem? I am hoping that it is a simple wire harness fix or sensor swap. Are all Gen 1 sensors interchangeable in the AT? (i.e. can I swap a sensor from a '99 AT to my '97?)