I have a 98 Ram 1500 and it has rear ABS only.
To see if you have four wheel ABS, the easiest way is to look at the back side of the front wheel. If there is just a brake hose, NO front ABS.
Is there is a brake hose and a wire then you have four wheel ABS.
My ABS and brake light are on and my speedo is working fine.
I'm gonna change the ABS sensor.