The transfer case is two-stage, mechanical, has an additional downshift (Fig. 1)

A modernized “fine-module” transfer case can be installed on some vehicles, in which the teeth of the front and rear axle engagement gears, as well as the gear rims of the rear and front axle drive shafts, are made with a 2.5 mm module (instead of 3.5).

UAZ transfer case

Fig. 1. Transfer box

At the same time, the low gear ratio decreased and became 1.47 (instead of 1.94).

The transfer boxes are interchangeable and look the same.

The modified parts differ from similar parts with a 3.5 mm tooth module in the number of teeth.

Transfer box maintenance

During operation, check the oil level and change it at the time specified in the lubrication table.

Check all fasteners periodically.

If a leak is found, find out the cause and replace the defective parts (gaskets, cuffs, plugs, etc.).

During the operation of vehicles, it is possible to lower the oil level in the gearbox by up to 8 mm relative to the lower edge of the filler hole and at the same time increase it in the transfer case.

In this case, it is not necessary to equalize the oil levels in the gearbox and transfer case, since the total volume of oil ensures the normal operation of both units.

When changing the oil in the crankcase of the transfer case or topping it up, it is necessary to simultaneously bring the oil level in the gearbox to the lower edge of the filler hole.

On vehicles of the UAZ-31512 family, lubricate the shift lever axle through a grease fitting. Access to it is from below.

On vehicles of the UAZ-3741 family, when disassembling the control mechanism, lubricate the shafts and the lower support, and also adjust the front links of the mechanism.

The transfer box has no adjustments.