Before inspecting the parts of the gearbox, thoroughly clean, remove all deposits with a brush or scraper and clean the holes and splines from possible contamination; then flush (with kerosene, thinner, etc.) to remove and dissolve any remaining oil.

Remove the transfer case and clean it of dirt

Drain the oil from the transfer case.

Disassembly of the transfer case was considered in the article - Disassembly of the transfer case VAZ-2123

Before inspection, thoroughly clean all parts of the transfer box with a brush and scraper, and then rinse. Blow the parts with compressed air.

Disassembly of a partially synchronized gearbox

Disassemble in the following order:

Remove the side cover with the switch mechanism.

The design of the gearbox is discussed in the article - Design features of the rear gearbox VAZ-2123

We wash and clean the gearbox from dirt and oil.

Before disassembling, clean the outside of the box with a cleaner or solvent.