Originally Posted by Infinite
The only thing the ecu should be looking for is that the rear wheels are at or slower than the speed on the front wheels.
as long as you keep it like that, it should be an issue.
I dont think the ecu works rpm vs. wheel speed unless you're below 10mph
The speed sensors are connected to the ABS controller and from there it outputs the front and rear wheel speeds in a summed/2 fashion. The actual speed reference that the transmission uses to compare to the N2 speed sensor is read via CAN. There really isn't a way to make this work and no, speedo healers will NOT work for this application as the only things that don't use the CAN for speed outputs are the radio, amplifier and wipers. As for what waldig suggested, you could tie the front and rears together but the problem there is that the front and rear wheels spin at different speeds so you'd have to hope that the speed difference would be within tolerance but then, the first time you spin the tires, you'd fault the TCM into thinking there is massive slip in the transmission as the N2 does not match the summed wheel speed sensors divided by the final drive ratio or 3.27. There are lots of systems at play here and unless you can account for every single one, you're bound to have a problem sooner than later.