Tilt Column Shifts Out of Park Without Using Column Shift Lever

[69_hafton]

I noticed months ago - while I was working in the engine bay - that this tilt column will shift out of park without pulling the shift lever on the column. Pretty scary, I thought and I will have to be wary of this while working on/under the truck.

Where to I need to look for the problem? I've got the column torn down to replace the turn signal switch and am going to just rebuild it while I doing it. New bearings are in order and I was surprised to have to remove a mud-dobber's nest out of the hub.