TM  10-3930-638-24&P 4-4.   TRANSMISSION   MAINTENANCE   (cont) c. Transmission Rear Cover (cont). STEP LOCATION ITEM ACTION REMARKS REMOVAL  (cont) 18 Two nuts (21) Remove 19 Two lock washers (22) Remove 20 High and low shift rail Remove support  (23) 21 Shift rail oil seal (24) Remove  and discard 22 O-ring (25) Remove  and discard 23 Plug (26) Remove Remove only if necessary 24 20 cap screws (27) Remove 25 20 lock washers (28) Remove 26 Three  locating  rings  (35)  Remove 27 Rear cover (29) Remove Use  pry  slots  provided  and  pry  rear  cover from transmission housing. Use a soft hammer to tap on low clutch, idler, and output shafts to prevent rear cover from binding 28 Rear cover to case Remove  and Clean all traces of gasket from transmission gasket (30) discard case 4-164 Change   1