Maybe someone who works at a dealer might know?

friend of mine just bought a 98 Dakota with a viper spec T-56 swap done to it. this gearbox has the electronic speed sensor inside of it, or at least, it would appear that way by the electrical connectors coming out the side of the case.

I'm about to swap him rear axles as well, but mine does not have the tone ring inside of it for the factory speed sensor--I left it out because I didn't feel like fighting with it to get it off the stock ring gear, and transfer it to my near ring gear...especially when I was running a carb'd motor without any computers, and didn't need the speed sensor.

well, his truck is still a computer controlled EFI truck.

is there a way to program the computer to be happy with the signal from the T-56 speed sensor and use that, instead of having to tear open the diff on my axle just to add a tone ring to the ring gear for the speed sensor?

I know that the parameters are programable somewhat, because you can change the calibration based on tire sizes, but how wide of a range can you go with?