How many speeds sensors are on a my 2000 Dodge 2500 V10 truck?

What is your question?

We have a 2000 Dodge 2500 V-10 truck. The speedometer won't work. We used to have a light on the dash that said ABS and the Brake light was on. We replaced the speed sensor on the rear end, on the transmission and the speed sensors on both front wheels. It would work when we tried it, but the next day, it wouldn't work. I bought a new Rear End speed sensor to make sure the one I ordered online wasn't faulty, which it wasn't . Now, are there any other speed sensors on this truck that we don't know about? We have not had it checked to see if it does throw any codes, so that is next. We heard there may be one on the Steering Column, but don't know and haven't found any. We just don't understand why it may work one day, then quit and not work again for a period of time.

What makes this problem better or worse?

It just doesn't work after it has worked the previous day and now it won't work at all.

How long has your 2000 Dodge Ram 2500 had this problem?

3 weeks