So the truck lasted problem free about two years after big rebuild, good run for a 200k truck with $2k refresh.
Air ride compressor is out again after 50k miles or so.
But the big problem is new no start and dead OBD2.
The truck just died on the go and wouldn't crank after. It has all the symptoms of a dead battery but its not it, I also bench tested the starter... Ok.
Recently I started getting low engine power and it would clear by turning the ignition off.
All fuses ok, starter relay tested ok.