Mainshaft and Countershaft

1. Mainshaft
2. Bearing
3. 2nd gear
4. Inner cone
5. Double cone
6. Synchronizer ring
7. 2nd synchronizer assembly
8. 1st/2nd clutch hub
9. Synchronizer key
10. Clutch hub sleeve
11. Synchronizer key springs
12. 1st/2nd clutch hub assembly
13. 3rd gear
14. Bearing
15. Inner cone
16. Double cone
17. Synchronizer ring
18. 3rd synchronizer assembly
19. 3rd/4th clutch hub
20. Synchronizer key
21. Clutch hub sleeve
22. Synchronizer key springs
23. 3rd/4th clutch hub assembly
24. 4th synchronizer ring
25. 1st synchronizer ring
26. Bearing race
27. Bearing
28. 1st gear
29. Countershaft
30. Countershaft center bearing race
31. Countershaft front bearing spacer

Assemble in the order shown, referring to Assembly Note.

Assembly note
2nd, 3rd synchronizer assemblies





Install the inner cone, double cone, and synchronizer ring as shown in the image. The 1st synchronizer ring has two teeth fused together at three places around its outer edge.

1st/2nd, 3rd/4th clutch hub assemblies




1. For the 2nd and 3rd synchronizer assemblies, align the synchronizer ring grooves and keys, and fit the inner cone tabs into the clutch hub slots.




2. For the 1st and 4th synchronizer rings, align the synchronizer ring grooves and synchronizer keys.

Standard Key Dimensions:

Standard key dimensions




3. When installing the gears and clutch hub assemblies in the following procedure, make sure that they are installed in the direction shown in the image.




4. Set the needle bearing, 2nd gear, 2nd synchronizer assembly, and the 1st/2nd clutch hub assembly on the mainshaft. Press the parts onto the mainshaft while keeping the parts from becoming crooked or misaligned.




5. Set the needle bearing, 3rd gear, 3rd synchronizer assembly, and 3rd/4th clutch hub assembly on the mainshaft. Press the parts onto the mainshaft by using the SST, while keeping the parts from becoming crooked or misaligned.




6. Install a new snap ring on the front of the mainshaft.

Countershaft center bearing race




Press the countershaft center bearing race onto the countershaft by using the SST.

Countershaft front bearing spacer




Install the countershaft front bearing spacer. If the countershaft front bearing or countershaft front bearing spacer is being replaced, replace them as an assembly.