My names Juan, from Detroit I own a 2000 4.8l sierra w. a 5/6 drop,silverado 20's,singlecab,fiberglass stepside bed. Been over due but finally purchased my 6.0l bone stock w. 55k miles on it and 4l65e tranny. Best idea to build while out. Friend of mine suggested 224 cams,said my 317 heads were good,rebuilt the 65e and buy a 3000 stall Two converter. pace setter headers,and a dyno tune. My question was what should I get to rebuild the trans to last, some people like shift kits,others say they brake sh*t. Input? I'm aiming at low 13's high 12's and I would be satisfied.