I have heard that these drive shafts on the 2wd NNBS CC/EC like to let go at around 100mph. Could I just get the stock one high speed balanced and be okay?
Truck has a trick turbo kit too.

 

Actually needs to be bigger diameter or split into two pieces (or made of a different material). The problem is the physical material reaches a point where centripetal force causes a harmonic wave to ripple the length of the shaft. When you hit a certain speed above 107-111, the ripple reaches a critical peak at a single point and the driveshaft shatters.

Simply balancing it won't help you much due to the design of a driveshaft.