TM  10-3930-643-34 GENERAL  SUPPORT  TRANSMISSION  MAINTENANCE. 15-5. Second and Third Gear Assembly. (Sheet 16 of 17) ASSEMBLY 90. Install gear (4). 91. Install gear (3). 92. Heat races (2) to 250 degrees F. 93. Using  insulated  gloves  and  plastic hammer, drive races (2) onto shaft (39). 94. Using  retaining  ring  pliers,  install new retainer ring (1). NOTE Inner and outer races are the same thickness in third gear. 95. Install thrust bearing (23) and race (22) onto shaft (39). Go to sheet 17 15-71