TM 10-3930-669-20 7-21.  TRANSMISSION CONTROL SWITCH REPLACEMENT. This task covers: a.  Removal b.  Installation INITIAL SETUP Tools and Special Tools Equipment Condition Tool Kit, General Mechanic's: Automotive Engine OFF (TM 10-3930-669-10) (Item 1, Appendix B) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) Batteries disconnected (Para 7-48) Steering wheel removed (Para 13-3) Materials /Parts Tags, Identification (Item 21, Appendix C) Nut, Lock a.  Removal. NOTE Replacement  procedure  for  reverse  transmission  switch  is  shown.    The  forward  transmission  switch  is replaced the same way. (1) Remove four screws (1), upper cover (2), and lower cover (3) from steering column (4). (2) Remove horn ring (5) from steering column (4). 7-46