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This is generally a job you want done professionally. If your asking questions about what you need to know to do gears its a safe bet you probably shouldn't do it yourself.
Haha yea man its a touchy process, if you dont know what you are doing 100%, save up about 300 bones and have it done professionally as ubserstang said.
yeah I know all of this.. But its not rcoket science.. I just want to know all the specs.. so I can set it up right.. I have dont them before.. but it has been like 4 years now, and it was on a different rearend