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Davemac2 is right. There are many reasons why a Shift E solenoid code is set. A simple voltage/compressed air test should rule out the solenoid itself (you may even find it working!). Any with transmission issues fluid condition and level is another. With these two out of the way, the lock-up clutch is another place to look at.
If you're delivering pizza at low speeds stop-and-go, I'd hope you drain/refill the fluid at 7500 mile intervals. And change the strainer at 15000 intervals. It's perfectly ok to use Walmart Supertech Dexron II/III compatible fluid. It's economical and works very well. The problem is not so much the fluid life but the amount of debris loading too. To change synthetics at this kind of interval is expensive. However, I believe SuperTech Ford-approved Mercon V is Dexron II/III compatible. This is an inexpensive way to go semi-synthetics.
Your Aisin A series transmission (140E) is decent but very dirty because it's not filtered (only strainered). To me, strainer is bad news, I like to see modern transmissions filtered.
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