If you are wondering what type of rearend or even what size it is this should help. You can find the axle code on the tag that is mounted directly on the axle housing. Another sopt is a white sticker located in the doorjamb there is either a number or letter under axle. Conventional or "open" rear ends break down as follows: 8-2.73, Y-3.08, 5-3.27, F-3.45, 6-3.73. Locking or "Traction Lok" break down as follows M-2.73...​