Axle ratio: look at the door tag, bottom line. One box is labeled axle. This chart tells you what the gears are.
CODE: DEFINITION:
42 -- 3.45
44 -- 3.73
47 -- 4.10
D2 -- 3.45 (limited slip)
D4-- 3.73 (limited slip)
D7-- 4.10 (limited slip)
Quite a few parts are interchangeable with the Ranger, but not all. For one, I think the Ranger is slightly wider and the axle mounts don't quite match up.