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I did some further research into this idea. I took the Dakota's TCM (Transmission Control Module, also known as the transmission computer) out of the Dakota, and temporarily installed it into the Durango in order to change the tire size setting.
Along the way, I also inserted a thin washer between the throttle stop and the throttle sector, so that the TPS would read slightly more open at idle than previously. As the engine would be stopped during the time I would be changing the tire size setting, this was not seen as having any problems. I did this because I considered that the TCM might reset its minimum TPS voltage when it received the new tire size setting.
The programmer used was my trusty old Snap-On MT2500. It allows me to enter in the revolutions-per-mile setting manually, as opposed to changing the tire diameter in 0.25 inch increments that my SuperChips programmer is limited to. I set the tire revolutions-per-mile setting to 624, which corresponds to a 32.3 inch diameter wheel.
I then re-installed the Dakota's TCM back into the Dakota, and restored the Durango. (this included removing that washer - don't want to have loose hardware rattling around)
This morning, on the way to work, at speeds above 45 MPH, the Dakota managed to keep its torque converter lock-up on 5 out of the 6 upward inclines I normally encounter. The lone incline, that saw the Dakota go out of torque converter lock, is rather steep, anyhow. The Dakota also engaged 5th gear at 51 MPH, which is much better than the 57 MPH it had used in the past.
It appears that this idea does work pretty well. It also appears that using that thin washer to temporarily increase the TPS reading, during the procedure to change the TCM tire size setting, also works. I'll do this to the Durango tonight.
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