2013 Peterbilt 388 - ABS light keeps coming on and speedometer stops working

2013 Peterbilt 388 - ABS light keeps coming on and speedometer stops working - Have changed the ABS wheel speed sensors and keeps doing it. Anybody have any suggestions? It seems to happen more when I hit bumps and turns off and on. There’s no speedometer sensor on the back of transmission. So I am guessing VINDEX is getting the speed on the wheel sensors. LAST SIX OF VIN: 200011
Had it into a couple of shops and they can’t figure it out.