| No Letter |
- |
Vertically Offset (input above output) |
 |
| A |
- |
Down-Angle |
| IV |
- |
Integral Vee-drive (flanged on to engine) |
| M |
- |
Mechanical clutch actuation |
| V |
- |
Remote Vee-drive |
| TS |
- |
TS: 2-Speed (power-shifting) |
 |
| NC |
- |
No Clutch |
| NR |
- |
Non-Reversing |
| NR2 |
- |
Non-Reversing, two shafts (input above output) |
| NR2B |
- |
NR2B: Non-Reversing, two shafts (input below output) |
| NR2H |
- |
Non-Reversing, two shafts (input horizontal output) |
 |
| D |
- |
Diagonal |
| H |
- |
Horizontal |
| C |
- |
Coaxial |
| B |
- |
Input below output |
| SG |
- |
Splitter Gear (additional primary gear stage) |