Clunk from rear

I got a 10 taco with 6112(5th notch) and5160 rear shocks and darak leafs. When going over uneven bumps I get a heavy clunk from the rear and you can feel it in the floor. When lifted off the ground the driveshaft where the slip joint is if I hit the shaft it makes a loud noise. I have a new shaft on the way from Toyota. My extended warranty covered it. Y'all think it could be anything else. I checked the front end and it's all tight.

 

Could be a bad shock. Had an old man emu rear shock replaced under warranty a couple of years ago.

 

Don't think so