TM 9-2520-246-34 Figure 3-48. Repair and Replacement Standard Points of Measurement for Transmission Mainshaft Assembly. Table 3-2. Repair and Replacement Standard Points of Measurement for Transmission Mainshaft Assembly Fig. Ref Point of Measurement Size and Fit Wear Limits No. Letter of New Parts 3-48 A-M Fit of synchronizer and shaft splines .004L-.007L .010L 3-48 B Thickness of thrust washer .150-.152 .010 3-48 C Fifth gear to countershaft 3-49 M fifth gear (backlash) .006L-.012L .019L 3-48 D Inside dia of fifth gear 2.1250-2.1255 .001 3-48 E Outside dia of sleeve 2.1205-2.1210 .001 3-48 D-E Fit of fifth gear on sleeve 0.004L-0.005L .008L 3-48 F Third gear to countershaft 3-49 K third gear (backlash) .006L-.012L .016L 3-48 G Inside dia of third gear 1.9680-1.9685 .004 3-48 H-J Fit of synchronizer and sleeve splines .004L-.007L .0106L 3-48 K Second gear to countershaft 3-49 F second-reverse idler gear (backlash) .006L-.012L .019L 3-48 L Inside diameter of second gear 2.0780-2.0785 (*) 3-48 M Dia of shaft at journal 1.7500-1.7505 (*) 3-48 N Dia of shaft journal 1.9640-1.9645 .004 3-48 G-N Fit of third gear on shaft 0.0035L-0.0045L .010L 3-48 P Diameter of shaft journal 2.0740-2.0745 (*) 3-48 L-P Fit of second gear on shaft 0.0035L-0.0045L .010L 3-48 Q-R Fit of first-reverse gear on shaft splines .006L-.012L .016L 3-48 S Inside dia of bearing 1.5748 (*) 3-48 T First-reverse gear to 3-49 J countershaft first gear (backlash) .008L-.014L .019L 3-48 T First-reverse gear to reverse 3-50 G idler gear (backlash) .008L-.014L .019L 3-48 U Dia of shaft journal 1.5746-1.5750 (*) 3-48 S-U Fit of bearing on shaft 0.0002L-0.0002T (*) 3-48 V Dia of shaft journal 1.9688-1.9698 (*) 3-48 W Dia of shaft journal 1.0908-1.0913 .001 3-48 X Inside dia of synchronizer sleeve 1.9680-1.9685 (*) 3-48 X-V Fit of synchronizer sleeve on shaft 0.003T-0.0018T (*) 3-48 Y Inside dia of sleeve 1.7495-1.750 (*) 3-48 M-Y Fit of sleeve on shaft 0.000-0.001T (*) 3-48 W Fit of main shaft in 3-47 F-E bearing rollers, and input shaft 0.00261L-0.0044L .0059L 3-23