GMC, differential repair in Zevulun

GMC, differential repair in Zevulun.
Any problems with engaging the gear may indicate the need to repair the differential. The list of repair operations includes: changing the oil in the differential, replacing the speedometer gear, replacing the gears of the driven and driving semi-axles, replacing the differential bearings, restoring the shape of the surfaces of the semi-axles, changing the oil in the differential, replacing the oil seals, replacing the bearing.