Your some what limited to what you can use on your series 2 carrier. 2.56 and 2.73 . You could use the 3.08 and larger but would need a spacer behind the ring gear to make it work. since you will be taking it apart any way might be your chance to covert to a possi series 3 carrier. Then you can go 3.08 to 3.73 ratio with out a spacer. Just a thought.