Owner's Manual
Page 288
... Refer to the Maintenance Schedule to determine what kind of the filler plug hole. See Scheduled Maintenance on page 6-4. The proper level for the 2500 and 3500 Series is from 0 to 1/4 (6 mm) below the bottom of lubricant to 1 5/8 inch (40 mm) below the bottom of the filler plug hole...
... Refer to the Maintenance Schedule to determine what kind of the filler plug hole. See Scheduled Maintenance on page 6-4. The proper level for the 2500 and 3500 Series is from 0 to 1/4 (6 mm) below the bottom of lubricant to 1 5/8 inch (40 mm) below the bottom of the filler plug hole...