Welp, swapped hubs between axles (thanks for the idea @Extinct) and had some odd results - the three amigos went away. Really strange, definitely not what I expected. I even drove it about 20 minutes on the freeway just to make sure the computer had enough data to throw a code. Nothing though.

So, details - before starting, I cleared the SLABS code that was showing along with the P1592 code for rough road. I then swapped sides for both the hubs and their ABS sensor pigtails. I figured, if the code stayed with the rear-left, I could then try replacing the ABS wire and go from there.

Didn't take much time, about 1.5 hours. Got to break out the big boy torque wrench too, so that was fun. I was real close to just ordering two new hubs last night and just chalking it up to ¯\_(ツ)_/¯ but hey, a couple enjoyable hours wrenching on the Disco and saved $600. So far... still waiting for the amigos to reappear since there really wasn't anything done that should've gotten rid of them.

BTW, both hubs were Timkens, so maybe original? The ABS sensor wires definitely were *not* original though. Looks like someone put front wires on the rears at some point. The right-hand hub had a lot of resistance when turning. The left one was definitely more free-spinning by comparison and had maybe a slight bit of coarseness.

 

Did you keep the sensors the same or move with the hubs?

 

I moved the sensors with the hubs.

 

Update: Drove around a ton today and still no amigos. In the past they would've reappeared by now if it was just the computer needing more time to register a problem. Kind of odd, but I'll take it.

Also interesting, the hub that had the problem was a BEAR to get the nut removed from, but the other side was super easy, almost like it wasn't fully torqued down if it was ever worked on before.

 

My guess is you had a loose connection at the sensor connector. Always a good idea to use dielectric grease on those connectors.

 

Yep, do all you can to eliminate the easier, less expensive causes before moving on.

But I wonder, if I had a big a$$ torque wrench like that would I just want to break it out and use it again? Brandon318 may have swapped hubs more times than the rest of us here combined!