Reverse Lights Not Working

Randy,
This is what it says in my Torqueflite A-727 (similar) Transmission Handbook:

"To replace the switch, begin by placing a container under the transmission. Remove the switch; have an assistant move the gearshift lever to the "Park" and "Neutral" positions. Make sure that the arm on the valve body is intact and centered in the hole. It is fairly common for the plastic wiper on the detent arm to become loose or break. The detent plate itself can become loose from repeated abuse. Either of these conditions can cause problems with neutral safety switch operation. Replace the gasket and thread the switch back into the case, tighten to 24 ft-lbs. Refill the transmission as required."

"To test the switch for neutral safety function, remove the wiring connector and check for continuity between the center terminal and the case in the "Park" and "Neutral" positions only. Be sure to confirm the gearshift adjustment prior to condemning the switch."

In other words, the switch could still be correct and functioning, but the gearshift selector or detent arm could be out of adjustment.

Keep us posted,
Jerry