Transmission selector works but won't go in for or revers

Hello, did the transmission engage any gears before changing the fluid and filter? This AXOD-E / AX4S automatic transaxle, even in the 1990's could develop issues with engagement and internal failures. You absolutely need to have serviced it regularly for the last 23 years every 25,000 miles with a complete fluid and filter change, and even then you could experience an issue. The transmission range sensor should be checked for functionality, as well as the wiring connector that plugs into it. This is the switch that tells the transmission where you have moved the shift lever to, and will allow engagement. If this is working, then you have an internal issue. Good luck -- for a shop near you that can assist in a diagnosis, click this link: http://repairpal.com/lincoln-within-10-miles-of-omaha-nebraska-68137