TM 10-3930-659-20 6-37. REVERSE WARNING ALARM SWITCH REPLACEMENT. 1. Install new preformed packing (2) and reverse warning alarm switch (3) on transmission control valve (1). 2. Connect transmission harness (4) to reverse warning alarm switch (3). FOLLOW-ON TASKS: • Install right transmission side guard (see paragraph 14-7). • Install right side cab skirt (see paragraph 14-6). 6-139