My brother bought my SS and has since modified it more. It is pushing ~ 420 rwhp and he has a NX 100 dry shot on it. He has a SS3600 and the stock transmission is dying. It slips very badly in third gear. He wants to get a good dependable transmission for street and strip but when he is driving it on the street he wants it to be relatively comfortable. What are you're suggestions and experiences. I'm looking at FLP and considering the RPM transmission that Thunder sells. Any help will be appreciated.