Models are equipped with a 4-speed or 5-speed manual transmission, which is a gearbox and differential unit. The drive through the gears of the gearbox is transmitted to the gears of the differential, which rotate the drive shafts.
All forward gears are synchronized. The floor-mounted shift lever controls the internal gear selector via a drive linkage.
The gearbox overhaul procedures described below do not include bearing replacement. Installing new bearings or shafts requires the use of special tools that are not available to the motorist.