Need some info guys, slowly but surely building my first drag bike, Had a 4mill Full drag ported motor built by Jeff, finally ditched the T5's and got me some cpi oof's, fuc*ing things rips hard for what it is ONLY....I catch all kinds of hell shifting, had several mods done while jeff had it but i need a tranny? so someone please explain the differences between dunable non dunable, straight cut etc? Im green when it comes to trannys.... Im thinking i want a 2-5th clutchless man 6th?