TM 10-3930-643-34 GENERAL  SUPPORT  TRANSMISSION  MAINTENANCE. 15-3. Transmission Assembly. (Sheet 19 of 26) ASSEMBLY 131. 132. 133. 134. 135. 136. 137. Install  retaining  ring  (75a).  new gasket (75) and cover (74). Using a 9/16" socket and socket wrench  handle,  install six lock washers (73) and bolts (72). Press new seal (79) into retainer (82). Using  retaining  ring  pliers,  install retaining ring (84). Position  new gasket (83)  and retainer (82). Install six lock washers (81) and bolts (80). Using a 1-7/16"   socket and socket wrench handle,   install  retaining  ring (78), yoke (77a),   washer (77) and nut (76) on clutch pack (128). Go to sheet 20 15-41