TM  10-3930-643-34 GENERAL  SUPPORT  TRANSMISSION 15-5. Second and Third Gear ASSEMBLY  (cont) Inner races of second gear thinner than those used on face of gear. Do not mix MAINTENANCE.  (cont) Assembly. (Sheet 15 of 17) are outer or interchange races. Failure to follow this procedure could result in damage to transmission. 85. Install thrust bearing (10) and two races (9). 86. Position gear (7) on shaft (39). 87. Install bearing (8) in bore of gear (7). 88. Rotate gear (7) back and forth to engage teeth of gear with teeth of clutch plates. If gear does not bottom out fully, remove it and visually  aline  clutch  plate keeping gear from bottoming out. Repeat installation  procedure. 89. Install thrust bearing (6) and two races (5). Go to sheet 16 15-70