TM 9-2520-246-34 Figure 3-49. Repair and Replacement Standard Points of Measurement for Transmission Countershaft and Gears. Table 3-3. Repair and Replacement Standard Points of Measurement for Transmission Countershaft and Gears Fig. Ref Point of Measurement Size and Fit Wear Limits No. Letter of New Parts 3-49 A Inside diameter of bearing 1.7332-1.7337 .001 3-49 B Inside diameter of drive gear 1.9995-2.0005 (*) 3-49 C Inside diameter of fifth gear 2.2495-2.2505 (*) 3-49 D Diameter of shaft journal 2.001-2.002 (*) 3-49 B-D Fit of drive gear on shaft 0.0005T-0.0025T (*) 3-49 E Diameter of shaft journal 2.251-2.252 (*) 3-49 C-E Fit of fifth gear on shaft 0.0005T-0.0025T (*) 3-49 F Second-reverse gear to 3-48 K mainshaft second gear (backlash) .006-.012L .019L 3-49 F Second-reverse gear to 3-50 F reverse idler gear (backlash) .006L-.012L .019L 3-49 G Diameter of journal on shaft 1.3788-1.3782 (*) 3-49 H Inside diameter of bearing 1.3780 (*) 3-49 G-H Fit of bearing on shaft .0002L-.0002T (*) 3-49 J First gear to mainshaft 3-48 T first-reverse gear (backlash) .008L-.014L .019L 3-49 K Third gear to mainshaft 3-48 F third gear (backlash) 0.006L-0.0012L .019L 3-49 L Diameter of journal on shaft 1.7317-1.7322 .002 3-49 A-L Fit of bearing on shaft .0005L-.0015L (*) 3-49 M Fifth gear to mainshaft 3-48 C fifth gear (backlash) .006L-.012L .019L 3-49 N Drive gear to input shaft 3-47 D gear (backlash) .006L-.012L .019L 3-49 P Thickness of thrust washer 16GA (.0598) .007 3-24