The hydraulic block or hydraulic distributor, receiving signals from the electronic control unit, switches channels in the control valve block and controls the clutch engagement pressure

Remove the transfer case and clean it of dirt

Drain the oil from the transfer case.

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.

Wash gear parts thoroughly before inspecting.

This will make it easier to identify wear and damage to parts

The gearbox is mechanical, with manual shifting, it has five forward gears and one reverse gear, all forward gears are synchronized.

The basic work of repairing a five-speed gearbox is similar to repairing a four-speed gearbox.

Disassembly and assembly of a four-speed gearbox is described in the article - "Disassembly and assembly gearboxes VAZ-2107”.