Call Andy warren at warren diesel. They're in PA. He builds what I would say is hands down the best trans for the money. More clutches ad more holding power, but in order to fit more clutches in there, lots of kits (suncoast, patc) use thinner steels to accommodate more clutches...thinner steels don't take heat as well ad the standard thickness steels. Andy warren among others (BTS, twisted diesel, john woods) cut down the piston to achieve more room for more clutches. You'll need a good converter too...don't buy a patc. Innate mine and will be pulling it out in favor of a PI converter. Andy mentioned that the stock intermediate shaft holds up to around 700 rwhp or so...I plan on being around 600 but I figured it was good insurance. I would definitely get a billet input shaft.