banging

So lately I've been getting these rather loud bangs when going over bumps even rail road tracks. It sounds like its coming from the driver side front end. I've looked under to see if anything is rubbing or binding. Can't see any damage or impact marks. All the TR ends are a year old, new LCAs, new track bar,shocks, springs. Everything is tight. Any sugestions would be great. It sounds like someone pounding on a door.
Would worn ball joints make such a noise?
Thanks Fletch

check your transmission mount when they go the exhaust hits the crossmember and thats the sound you get it took my 3 months to figure it out, you will see a shiny spot on the exhaust after the cat

hmm I don't think thats it either cause i just had the crossmember off when i did the t-case seals and everything is tight and it did it before that too