Method for determining the causes of vibration of the transfer case and body floor (in the area of the front seats)

First of all, note at what speed the transfer case vibration occurs, then proceed to determine the causes of vibration.

If vibrations appear after repair or replacement of transmission units:

1. Raise the car on a lift to a height convenient for work, loosen the nuts securing the gearbox support cross member to the car body and move the unit to the left until it stops (pic. 3-30). Tighten the nuts in this position. The arrow in the figure indicates the direction of the vehicle.

Attention. The presence of people in the passenger compartment during its lifting and repair is prohibited. Exercise extreme caution when working under a vehicle. To avoid injury, keep hands and tools away from rotating parts of the transmission.

2. If the defect persists, align the transfer case:

• Set the transfer case shift knob to the neutral position. Start the engine, shift into second gear with the gearshift lever. The car must not move. Raise the car on a lift to a height convenient for work;
• loosen the six nuts securing the transfer case to the body;
• turning the transfer case on studs, achieve such a position of the transfer case relative to the body, in which the vibration of the intermediate cardan shaft is minimal;
• while holding this mode, tighten the nuts securing the transfer case to the body;
• lower the car, stop the engine.

3. If the defect persists, install additional washers (pic. 3-31) 2.5 mm thick between the cross member of the rear support of the transfer case and the car body (one washer for each stud).


4. If the defect has not been eliminated, reinstall the rear propeller shaft, for which:

• unscrew the bolts securing the cardan shaft to the flanges of the transfer case and the rear axle gearbox;
• turn the shaft relative to the flanges of the transfer case and the rear axle gearbox by 180°;
• fix the shaft in this position.

5. If the defect has not been eliminated, reinstall the front cardan in the sequence indicated above.

6. If the defect persists, replace the rear propeller shaft.

7. If the defect persists, replace the front propeller shaft.

8. If the defect persists, replace the intermediate cardan shaft.