Rear wheel drive (Example 3 spd) parts......
Case
Input Shaft
front bearing
Input drive gear
1st speed gear
1st cluster gear (1)
2nd speed gear
2nd cluster gear (2)
3rd speed gear
Cluster gear assembly (1,2,3)
Cluster gear assembly shaft
1st & reverse clutch teeth
1st & reverse blocking rings
1st & reverse engagement sleeve
2nd & 3rd clutch teeth
2nd & 3rd blocking rings
2nd & 3rd engagement sleeve
Rear bearing
Reverse idler gear
Shift forks
Reverse cluster gear (3)
Output shaft

Powerflow...... 1st gear
Input shaft - Input drive gear - Cluster drive gear - Cluster 1st gear - 1st speed gear - Clutch teeth - Clutch sleeve - Clutch hub - Output shaft