new to the board and, just wondering if anybody can help me out. my question is, i have a 2001 2500hd with 8.1 allison auto, the problem i'm having is there is a noise which i think is coming from the trany.(its like a whinning noise/clatternoise) when the truck is cold it does it really bad. only when you take off and drive it. if you gas it it gets louder, it does this for about ten mins. then goes away. it will also make the noise even if you drove the truck all day and then shut it off for twenty mins. all thought it doesn't take quite as long go away. the truck had 36,600 miles when i bought it ,it now has 50,000 miles. the guy who owned it before me, bought it new and use to pull a trailer with about 9000lbs on it three times a week. i still have warrenty coverage for it but i would really like to know what it is before i take it to the dealer. i want to make sure they don't give me the shaft and try to tell me there's nothing to worry about . any thoughts would be appreciated thanks.