Heavyweight : Gearbox
- Gearing
- Transmission shafts
- Main shafts
- Countershaft
- Palette junction
- Epicyclic
- Gear shift
- Speed dial
- Synchronizer rings
- Units synchronizer
- Suspensions
- Oil cooler
- Directions
- Oil pump
- Oil filter
- Pressure relief valves
- Set of joints
- Control cylinder
