Ok first off i did do so search on this already and from what i have gathered its i don't think its the tranny but i wasn't sure on where to pose it otherwise. the pick up is an 06 F150 5.4L ive noticed the clunk about 2 or 3 times and id like to catch it early in case its something bad you know. I know two of the times i have noticed it i was driving up a steepish driveway at angle at a pretty good speed not flying up it but wasn't crawling up it either. I kinda think mine falls into the category of clunking when turning or driving up a curb is it the yoke issue or something else?