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The *Neutral Safety Switch* doesn't have a single *install & forget it* position, the switch can be rotated. The switch slides down over the selector lever that extends above the trans casing, one has to rotate the switch assembly into the correct position & lock it down for accurate trans shifting. One usually does so from the park position. If it's been moved it can cause what you're experiencing.      

I've got a 240a mechman alternator and need a shorter serpentine belt for my 5.3L GXP. Does anyone know where to buy one from?

No i'm not absolutely sure it's alligned. I wasn't aware it needed to be. It's my grandkids car, and I'm an Ironworker, not an auto mechanic. It's a 3.8. No idea what transmission is in it. 

Are you absolutely sure that the shifter mechanism on top of the case is properly aligned? It is an electro/mechanical device that has to properly positioned. The engine is the 3.8 or 5.3? The trans IS the 4T65e?

Update- So the new scanner didn't perform as expected, so i had my mechanic come out and recalibrate the brake pedal position sensor and he told me the car is starting (which it did already), and the shifter is moving into gear but it isn't engaging and he thinks it may be the transmission. I'm not sure how the transmission can cause reduced power, but it makes since that it's causing shifting and gear engaging problems. I just don't want to pay to have the transmission rebuilt and then have it turn out to be something else, i.e., more simple and less expensive.    My daughter is a single working mom with 3 teenage kids, one in his first year of college and the other two in high school. I should be finishing up on the grandson's car repair today. (He went off the road and I've replaced his radiator, condensor, fan, low pressure AC hose and a new compressor is coming in today.) Hopefully I'll have it back on the road by this evening. But with my daughter working full time as a nurse, and the 3 kids all in school and working, they are all depending on her Ford Expedition and its' wearing them all out. Any help or ideas on this will be appreciated.