Here's the update for any that are interested.
I brought the truck to an Allison Mechanic that works on school buses for the local school district.
He pulled the Control Module and replaced the sensor. While everything was apart a new harness was also added for good measure.
The only complicated part was getting the control module out after the front driveshaft was removed. There was very little clearance to bring it down straight without contacting the transfer case. A little bit of patience and 3 transmission jacks and it was out.
With everything back together, the truck drives great.
Now on to my next project of high speed gears or larger tires, or both. 55MPH and the engine is screaming, I usually end up cruising around 50MPH