OverDrive Switch in '94 TBird LX

The overdrive switch in my '94 TBird LX 4.6 stopped working a while ago. I searched the archives and noticed that a few other TBird owners had the same problem and the conscensus seems to be a relay that is bad. I have the service manual and can look it up, but for a place to start, does anyone know which relay I should be looking for??

THanks,
Mark