It is not necessary to regularly check transfer case fluid unless you suspect there is a leak or you hear an unusual noise. A fluid loss could indicate a problem. Have it inspected and repaired.
Fill Plug
Drain Plug
To get an accurate reading, the vehicle should be on a level surface.
If the level is below the bottom of the fill plug hole, located on the transfer case, you'll need to add some lubricant. Add enough lubricant to raise the level to the bottom of the fill plug hole. Use care not to overtighten the plug.
Refer to the Maintenance Schedule to determine how often to change the lubricant. See Scheduled Maintenance .
Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Part C: Recommended Fluids and Lubricants .