2nd Gen Bed Sagging

Hi looking for some help. New to the forum and just purchased an 05 tacoma. I noticed the passenger rear is sagging a bit. Between the body and the box the gap is two finger widths except for the bottom of the passenger side is only 1. Truck has original leafs springs could this be the issue? Or would you anticipate it being the bed mounts? Would appreciate any feedback.
Thanks!

 

In the top pic it appears the bed is a bit twisted. If so, maybe the frame or box is a bit bent? Not what you want to find out if you just bought it, and maybe I am wrong.

 

My 2011 leafs were sagging really bad. I got a leaf pack made by Alcan and couldnt be happier

 

leaf packs would not affect bed alignment. Your bed mounts could be cracked, they are hard mounts not like the bushing front cab mounts. Otherwise your frame might be bent, which hopefully is not the case.

 

Thanks guys found a patch on the rear passenger side which they didn't line up just perfect when welding. I presume this is the cause and ended up putting rubber spacers on that end of the bed to level it out. Seems alot better now. Got under it over the weekend and took a wire wheel to get the surface rust and old under coat off the frame and then painted it with rust check black looks a lot better and plan to get it under coated this week to try and preserve the frame the best I can


Although I'm running into a rough idle at start up every once and a while the truck will die within first 5-10 seconds of start up. Once it heats up seems to run fine.

Put a code reader on it and got the following codes:

P0328 - knock sensor?
P0328pd
P0171 - possible 02 sensor?

Would appreciate any further insight. Truck is the 2.7 4cylinder 5 speed

Thanks