Water infiltration caused a 4Hi condition for me on 2 occasions now. It also threw a check TOD light.

It was both frustrating and promising for the reasons mentioned above. I assume that the check TOD light was due to the varying values picked up by the sensor as a result of the water shorting across the contacts.

I think that varying the amount of perceived 'slip' by the rear TOD sensor would be the most elegant solution to the 4Hi option problem. By taking this route, the sensor would determine actual slip conditions while in Auto, but the user would be able to select varying degrees of "false slip" in order to divert power to the front wheels by the preset increments (just like the rally VX that Joe Black described).

I believe that I have seen a circuit (AFAIK it hasn't made it off the drawing board) that did exactly what I am describing. It had 4 options: Auto, Condition 1, Con. 2, Con. 3. Each condition assigned a percentage of torque to the front wheels up to 50% of total.

I have the means and materials to make this work, but I have exactly zero time to do the research. To me, this is the best solution because it allows user 'tunability' as opposed to a simple 2-4 option. It would also display correctly, as the mod would be in place at the sensor rather than between the clutch and the computer.

Flame away if it's worth it...