Owner's Manual
Page 406
Have it inspected and repaired. When the differential is cold, add enough lubricant to raise the level from 1/4 inch (6 mm) to about 3/8 inch (10 mm) for the 2500 Series. How to Check Lubricant ... the Maintenance Schedule to determine what kind of lubricant to the bottom of the filler plug hole, you hear an unusual noise. When the differential is at operating temperature (warm), add enough lubricant to raise the level to use. See Recommended Fluids and Lubricants on a level surface. A fluid loss...
Have it inspected and repaired. When the differential is cold, add enough lubricant to raise the level from 1/4 inch (6 mm) to about 3/8 inch (10 mm) for the 2500 Series. How to Check Lubricant ... the Maintenance Schedule to determine what kind of lubricant to the bottom of the filler plug hole, you hear an unusual noise. When the differential is at operating temperature (warm), add enough lubricant to raise the level to use. See Recommended Fluids and Lubricants on a level surface. A fluid loss...