Transfer case maintenance procedures are easy to implement since a typical car will display practical signs when repairs are needed. Although many automotive brands design different transfer case hardware, general equipment will develop similar problems once certain components are damaged or defective.
When shifting to another drive mode, the gears underneath the frame with interact with the wheel axles. If a transfer case needs maintenance, you'll experience a minor or major delay as the hardware adjusts to a different drive mode. Depending on the hardware...
