Hey i have this same problem with my jeep right now, its started last year with a lound clacking, i took the front cover off and 3 of the 4 bolts that hold the flex plate to the torque converter were turned almost all the way out, so i tightened them down, took care of the noise, well not its started again so i thought, same problem, opened her up adn found out NOPE, its a cracked flex plate, a chore to change from what i hear. i did some checking, a new flex plate from a dealership is roughly 93$ and its gonna be an all day project, so if u can do it yourself ur gonna save some money. my advice, check the bolts first see if they are loose, if they are, turn one out at a time, put some thread locker on them and put them back in. check for cracks in the flex plate, now matter how minor they look, ur gonna have to change it cus it will only get worse over time. hope i can help u out there, oh for reference, u will need a 12mm and 18mm wrench to get the dust plate of the front of the tranny.