Removing
If necessary, remove only one gearbox:
- drain the oil from the bridge beam;
- raising the rear of the car, place it on stands and remove the wheels and brake drums;
- unscrew the nuts securing the brake shield to the beam and extend the axle shafts so that they come out of the differential box;
- having disconnected 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.
Installation
Before installing the gearbox, thoroughly clean the axle beam from oil. Lay a sealing gasket on the mating surface, insert the gearbox and beam and fasten with bolts. Lubricate the threads of the bolts with sealant. Thoroughly degrease the bolts and holes in the beam before applying the sealant. Attach the cardan shaft to the gearbox. Install axle shafts and brake drums.
Install the wheel with the tire and screw on the wheel nut without tightening. With both wheels in place, remove the stands and lower the car; then tighten the wheel nuts with a torque wrench.
Fill the axle beam with oil through the oil filling hole, having previously cleaned and screwed the drain plug into the beam.
Note. Since 1984, a gearbox with a gear ratio of 4.1 has been installed, instead of the previously installed one with a gear ratio of 4.3. To distinguish the gearboxes, the numbers 21 or 2 are painted on their neck. The first corresponds to a gear ratio of 4.3, the second - 4.1. When repairing, it is necessary to install gearboxes with the same gear ratio on the front and rear axles. In this case, the speedometer drive on the transfer case must correspond to this gear ratio. The speedometer drive, marked I with green paint, is equipped with a gearbox with a gear ratio of 4.1.