164 Manual Drive Trains and Axles Copyright by Goodheart-Willcox Co., Inc. 1 2 3 7 8 9 12 13 14 28 26 29 30 31 32 33 34 35 36 35 4 5 6 17 16 15 10 11 33 37 38 28 27 26 25 24 20 18 19 21 22 23 1. Fill plug 2. Reverse lever pivot bolt C-clip 3. Reverse lever fork 4. Reverse lever 5. Transmission case 6. Extension housing gasket 7. Extension housing 8. Offset lever 9. Offset lever insert 10. Offset lever retaining nut 11. Access plug 12. Extension housing oil seal 13. Threaded plug 14. Reverse lever pivot bolt 15. First – second synchronizer insert (3) 16. First gear roll pin 17. Output shaft and hub assembly 18. Speedometer gear snap ring 19. Speedometer gear 20. Speedometer gear drive ball 21. Rear bearing retaining snap ring 22. Rear bearing locating snap ring 23. Rear bearing 24. First gear thrust washer 25. First gear 26. First – second synchronizer blocking ring (2) 27. First – reverse sleeve and gear 28. First – second synchronizer insert spring (2) 29. Second gear 30. Second gear thrust washer (tabbed) 31. Second gear snap ring 32. Third gear 33. Third – fourth synchronizer blocking ring (2) 34. Third – fourth synchronizer sleeve 35. Third – fourth synchronizer insert spring (2) 36. Third – fourth synchronizer hub 37. Output shaft snap ring 38. Third – fourth synchronizer insert (3) The teeth on the blocking ring are situated along the outside diameter of the ring. They match the straight-cut teeth of the mating gears and mate with the internal splines of the outer sleeve, Figure 8-13. The inside diameter of the blocking ring is tapered. This surface fits over the cone surface on the mating gear. The tapered surface of the ring has many small, sharp ridges, which enable the synchro- nizer to solidly engage the cone surface of the mating gear. Commonly, the inner (assembly) side of the blocking ring fits into the recessed region between the inner hub and the output shaft, where matching slots in the ring engage the inserts of the inner hub. Figure 8-9. Exploded view shows parts of the mainshaft gear assembly. The output shaft extends back through the extension housing. (Chrysler)