It's a 4X4 with 92K miles on it. Had it since new and it's been doing this washboardy stuff for about 2 plus weeks. Also feels like the truck rocks from side to side when you're driving (death wobble?)
I get the same thing but on when driving in 4x4 high, and only above say 40mph or something like that, I haven't rotated the tires in say 15k miles or so, so I am thinking that may have something to do with it. You guys think so?