We hang out the rear axle, drain the oil from the crankcase, remove the wheels and brake drums, take out the axle shafts. We disconnect the cardan shaft from the drive gear flange and take it aside (see Replacing the driveline).
key «at 13» unscrew the eight bolts securing the gearbox housing to the rear axle beam.
Remove the gearbox assembly.
We install the new gearbox in the reverse order of removal. We apply sealant to the threaded part of the crankcase mounting bolts. After installation, do not forget to add oil to the rear axle housing.