Hello, I have a '93 f150 4x4. Truck has 35,000 miles on it, new stock except aussie locker in the rear, warn premium hubs, and rancho shocks. I searched and checked all the related posts but still can't find my clunk. Some times when I go over big bumbs, or big ruts, but primaraly when I'm turning sharp left I get a huge clunking under the floor board. I swear it feels like the t/case yoke is hitting the floor board(obviously it's not). Every thing is tight, bolts nuts all there, radius arm bushings like new, ball joints ok. I can get it to get real loud on cement going up a hill around a corner if i get into it and don't let the locker ratchet. It's not the locker making the noise anyways. It's like someone is hitting my floor board with a hammer. Any suggestions please?

 

Also I forgot to mention that this started all of a sudden. Never done this untill very recentley.