You can do a tranny mod with no lock-up if you want,thats what im doing,1-5 is off the shelf stuff.I just got 1-4,5th-6th clutch,bearing mod on drum,new forks.Do you need a lock-up, how much Hp are you looking to toss at it.B4 you spend money on covers and lockouts therte is stuff inside motor that will benifit you more,straight cuts,overide,shift shaft mod,star.I have sick Hp to wheels, in a pm ill tellyou how much to many people wanna race.I use a F.A.S.T clutch on asphault with no probs