1) check the u-joints I bet that is what your prob is
2) how hard of a clunck are you getting? how old is the locker? and a little clunk is normal with an older detroit locker.
u-joints are new. the detroit only has about 800 miles on it. as for the clunk, depends on how im driving. if i drive like a complete grandma its barley noticable. but if im on the gas or release the clutch to fast its very audiable and will snap your head back. also some times it will pull to the left.
