The gearbox is placed in a cast crankcase attached to the left end of the cylinder block. The gearbox housing is equipped with holes for lowering, checking and adjusting the oil level, closed with plugs.
Rotation is transmitted from the engine crankshaft through the clutch assembly to the primary (leading) gearbox shaft. The input shaft is equipped with splines on which the clutch disc is mounted. From the input shaft, on which all the drive gears are located, the rotation is transmitted to the secondary (slave) manual transmission shaft, on which the driven gears of all gears are located. All transmissions are synchronized. From the secondary shaft, rotation is transmitted through the cardan shaft to the main gear and differential, from which the drive shafts are driven. The free rotation of the differential satellites on their axles allows the inner wheel to rotate more slowly than the outer wheel when cornering. The primary and secondary shafts of the box are parallel to each other, as well as parallel to the crankshaft and driveshaft.
Gear shifting is carried out using a backstage mounted on the floor of the passenger compartment by means of a lever mechanism for selecting gears. The mechanism consists of a set of shift forks, with the help of which the sliding clutches of the synchronizers move along the shaft, blocking the gears of the corresponding gears.