Manual transmission — general description (Peugeot 406)

The gearbox is housed in an aluminum alloy crankcase and attached to the left end of the engine. It consists of a gearbox, final drive and differential. On all models, except for the 2.1 liter diesel engine, the BE3 gearbox is installed, and the ML5T gearbox is installed on the 2.1 liter diesel engine. Both types of gearboxes are similar and work as follows.

Torque from the crankshaft of the engine is transmitted through the clutch to the input shaft of the gearbox, on which the clutch disc is mounted. The input shaft is mounted on ball bearings. Further, the torque is transmitted to the secondary shaft, the right end of which is mounted on a roller bearing, and the left end on a ball bearing. From the secondary shaft, torque is transmitted to the differential and to the drive shafts. In the neutral position, the input shaft and output shaft gears rotate freely and do not transmit torque to the differential.

The gearshift mechanism is actuated by a lever located on the floor of the car, using the shift rod on the BE3 gearbox or by a cable on the ML5T gearbox. The shift mechanism moves the corresponding fork, which moves the synchronizer and provides a rigid connection between the mainshaft gear and the mainshaft.