Dodge Ram Troubles

Last night after getting off work I started my truck and the Brake light, ABS light stayed on and I noticed when I drove home the speedo will not work until I get to 28 mph. Anyone have any suggestions as to the problem. I have not done any recent work on the truck.
The vehicle is:
2000 sport Ram 2500 long bed 2wd V-10

Probably the speed sensor in the rear diff. its a cheap and easy (guess) repair, I would start there.

no suggestion?? I did for get to mention that is also takes longer to shift from 1st to 2nd.
I can see maybe a sensor for the ABS giving a fault code which in turn would cause the brake light to remain on also.... But it seem strange that the speedo all of a sudden not working until I hit about 28-30mph and the tranny not wanting to shift until higher rpm. It seems the speedo and tranny shift problem are not related to each other. I can cause the tranny to shift at lower RPM by lifting on the throttle a little. Where as the speedo will not work until a certian spped. I also notice it is a little erratic between 30-40mph and after that is ok. And when I slow down to 30 or below it just drops down to zero as if the power was shut off.
I guess they can all be unrealted problems that all happened at the same time. But seem funny that I drove to work no problems, then 6 hours later start the truck and now all this happens.
---any Dodge Dealer mechanics that have seen this before. I have a handy dandy Haynes repair manual but we all know what that is worth. Any suggestions would help. This happened last night and have not had a chance to take to a dealer.

Sorry just saw the reply.. I thought about that. The handy dandy haynes mentioned tha with Rear ABS (RWAL) the the sensor is mounted on the diff housing.

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Probably the speed sensor in the rear diff. its a cheap and easy (guess) repair, I would start there.

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I have replaced a few of them.