I have a 05 Silverado 4X4 W/T 52,000 miles its the 5.3 alum. with auto trans/tow package. Recently the trans seem to slip a little, I service the fluid and filter (the fluid was still clean and no residue in the pan from the disc's or clutch plates?) It still has the same problem, and it sometime will shift hard or very noisy. The truck sometime will lundge when I start it and the trans makes a weird sound. (That happens only once in a while.) I read somewhere about having the dealer reflash the computer for the hard shift from 2nd to 3rd, and I was wondering if anyone knowsof or has had the say problem. I have owned the truck since new and this is the first mayjor problem other than air bag sensors going bad.