AODE with no 'P'ark

Sounds like you need to readjust the shifting rod that connects the shifter to the MLPS, it may have come loose. To do this, unbolt the shifter from the shifting rod - it's a 1/2 bolt if I remember correctly. Put the car in neutral, both with the shifter and by manually pulling the shifter rod towards the rear of the car all the way (Park) and then pushing it forward two clicks (Neutral) on the shifting rod to get it in Neutral. Then retighten the shifter to shifting rod bolt.

If you get under there and the shifting rod is still on tight and doesn't appear to have moved, check to see if the MLPS has somehow come loose. (two screws on the tranny).

If the MLPS /has/ come loose, put it in neutral and look with a flashlight for two notches cut into the MLPS - line them up, tighten it down to the tranny and then follow the instructions above for setting up your shifter properly.

Good luck,
Wes