I have the same thing. Just remember a small amount of oil can cover a lot of stuff. I've checked mine every couple weeks and it's still says full.
1998 4.0 5 speed, Superior super 35 rear, Superior super 30 front, yukon air lockers x2. 3" Terra Flex suspension lift, 1.25" BL, 1" MML Engo 9K winch, Dick Cepeck Radial F-C 33/12.5/15.