Redfoxco, can't find ratios from Branson. They have kilometers per hour in the specs, but I got these MPH from the Century manual. I couldn't get the spreadsheet to post exactly as I'd like, but the first column is the speed number, the second is MPH forward, and the third MPH reverse:
1 1.05 1.00
2 1.23 1.17
3 1.64 1.57
4 2.31 2.21
5 2.56 2.45
6 3.00 2.87
7 4.03 3.85
8 5.67 5.42
9 6.16 5.90
10 7.23 6.91
11 9.69 9.27
12 13.64 13.05
As jar as the power & torque curve goes, I'm trying to find that out myself (earlier post). Hope this helps and good luck on your search.