My dual BL set-up

[RC-Monster Mike]

You should stick with the stock tranny gears and the UE idler. you will blow the lightweight gears up under dual power. the y adapter will allow you to plug both controllers into the throttle channel on your receiver. You can get them at your local hobby shop (not sure what is local for you, but Ultimate Hobbies will definately have it, although they are about 45 minutes or so from Corona).