Go to http://www.ring-pinion.com and download the manual (pdf file), its under tech stuff or something like that. The manual from Randy's is the best I've seen, its a pdf. I bought all my diff stuff from Randy's 2 years ago, but they now carry Yukon Gear which I am unfamiliar with, although I can't imagine them carrying anything thats not topnotch.

Brad
ORC Land Use Editor

and
http://rockgarden.rockcrawler.com