you know, i've been reading this thread for a few days now. the clunk you're talking about, i think i have. but mine, you can't hear it or can't really feel it until you look for it. it's not like a five gallon bucket of water hitting the tail gate everytime you acclerate or stop, mine is very slight, more like something catching, either the tranny or rearend. i took it to the dealer two times. first time they said "oh it's your limited slip catching" , i found out here that i don't have limited slip. so WTF? the second time, they said, it's your tranny catching, normal. so i told them, that's fine. if anything seriouse happens like the rearend going out or tranny, don't say i never brought it in, i have the paper work that i did. so now, i don't care. if something is going happen, they're gonig to fix it! if not, lemon law baby. i know it's annoying and i know you paid alot of money for it and it's a brand new truck. do you have warranty on the truck? if you do, take it back when some does break. if my truck did the same exact thing as yours and they coudln't fix it. i'd wait till something broke. if something did break, they're not fixing, i'm getting a new truck. taken it 5times to repair, didn't repair now broke. lemon law, new truck.
BTW, any idea on what could be causing mine? when i stop seems like something is sitting back in it's place. when accelerating, have this catching/jolt feel. very slight though.