Bearings were replaced when all the other work was done

 

My guess is you speed sensors (black wire going to the wheel bearings, need an Allen wrench to get it off). I suggest pulling them out and looking in the bearing for rust, and also look at the end for any possible foreign objects or rust on it. Also check the spacer, make sure there is one and only one on each. I changed the bearings on a friends blazer and accidentally put the new and old spacer on and had the "skipping" issue. Took a spacer off and it was perfect. And also check the wires and see of they are pinched. That's my best guess.

 

Just got this truck to be used as a plow truck
ABS does strange things like pulsing when not needed.(low speeds) but then again have not drove with it far yet
I have not gotten under truck yet as I am dealing with bad leg medical issue right now.
Many codes that I just cleared to see what comes back
c0252, c0222, c0223, c0225, c0281, c0265, c0245, c0241, c0251, c0242
thinking of just puling fuse since i really don't care for ABS anyways. I like the skid stop.