1. If necessary, remove only one gearbox.
2. Drain the oil from the bridge beam.
3. Raise the rear of the car, put it on stands and remove the wheels.
4. Unscrew the nuts securing the brake shield to the beam and remove the axle shafts so that they come out of the differential box.
5. Disconnect the cardan shaft from the gearbox, place a stand under the gearbox housing, unscrew the bolts of its fastening to the rear axle beam and remove the gearbox from the beam without damaging the gasket.