Ole, to figure the gear ratio of the DD use this formula 76 (# of teeth in ring gear) divided by 34 (# of teeth on sun gear) This # stays the same no matter what. 76/34=2.235. Now for the input gear and transfer gear you do the same. Stock 06 700CF EB has 65/55 gears. Take 65/55=1.181. Now divide 2.235 by 1.181 and you get 1.892. The only gear ratio that changes is the input and transfer gears and they must add to 120. (65+55=120, 60+60=120, 57+63=120) If you change to 57/63 gears your output would be 2.47. (2.235/.904=2.47)
Hope this helps you out. By the way, love the 4" riser. Thanks,