Figure 8-23 - Transfer case shift linkage adjustment.
2.1.6 fer Case Shudder
Transfer case shudder is a jerking motion that typically occurs during acceleration.
Possible shudder causes are low fluid level, loose transfer case fasteners, worn gears
or bearings, or defective internal clutches. A shudder may also occur at low speeds on
vehicles with a defective viscous coupling or clutch pack.
When diagnosing this problem, make sure the shudder is not caused by the engine,
clutch, transmission, limited-slip differential, or universal joints. Check the fluid level,
and make sure all fasteners are tight. Pay particular attention to the fasteners holding
the transfer case to the rear of the transmission. If fluid level is at the normal mark, and
the fasteners are tight, it will probably be necessary to remove and disassemble the
transfer case to locate the problem. If the vehicle has a viscous coupling, check for
silicone in the transfer case lubricant. Because silicone does not mix with oil, it will
appear as globules in the lubricant. This will indicate the silicone has leaked from the
viscous coupling and the coupling requires attention. If the viscous coupling has failed,
check the different front and rear axle ratios, which may have caused it to fail. Refer to
Figure 8-24
for quick reference to troubleshooting.
NAVEDTRA 14050A
8-33