I got a 99 dodge ram 1500 5.9 4x4. When I go above 45 ish Speedometer start jumping around. I watch live d.a. and it's doing same thing. Abs and brake light been one before this started happen. I can't communicate to the ABS module.

 

Tried a new speed sensor yet?

 

Yep. Swap out the sensor on top of the rear diff.