Like the others said, I would recommend against running different sized tires. The TOD does NOT like it and will go crazy shifting into, and out of, 4WD. In case you don't know the TOD works by sensing the speed of each wheel. When it senses one wheel spinning faster than the others (like spinning your wheels on ice), it activates the clutches in the transfer case and sends some percentage of the power to the front wheels. It does this in quick little spurts and does not lock the transfer case into four wheel drive. It will continue to do this until all four wheels start rotating at the same speed (you stopped skidding on the ice), at which point it goes back into monitor mode and leaves the transfer case in two wheel drive mode (sort of). IF you use different sized tires, the TOD senses that some of the tires are rotating faster than the others (due to different diameters) so it thinks that the tires are slipping and it goes into it's little dance of pulsing power to the front wheels, but since it can't ever correct what it sees as a dangerous situation (wheel slip) it will continue to pulse power to the front wheels which puts a lot of wear and tear on all of your drive train components. (sorry for the explanation if you already knew how the TOD worked)
If you really want to do this, I would think that you would have to disconnect the TOD computer to take it completely offline so it won't be fighting against the different tire sizes. You could still manually drop the transfer case into 4lo, but that would be about it.
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