I think I might have solve the mystery. The TOD has an inertia sensor box under it near the rear axle. Which has a mercury switch type set up. I noticed with the bigger tires the unsprung weight in more and the ***** end drops when I accelerate because the rear coils flex more than the front torsion bar which are stiffer. This probably fools the sensor unitl the Vx is straight and level again. Before I put the bigger tires on I noticed that on steep inclines regardless of speed 2 bars would light up on the TOD. I guess the 2" in height combined with the greater unsprung weight could be the culprit.