Wrong on a couple of accounts for several of the stuff noted here.
1. Draining and refilling get's about a third of the fluid in the system, nowhere near half. The majority of the fluid is in the torque converter.
2. Although you don't need any bolts to change the filter, you better have the correct torque on the filter bolts as they do go through the valve body. With an over tightened valve body, you will run a very high chance of ovaling out the shuttle valleys and eventually lose the shifting that the valve body controls. It takes a bit, but it can let the clutches start slipping and eventually take the trans out with it. All due to a service 10k ago. I use an inch pound torque wrench and put them back to 61 inch pounds (used bolts, if I use new bolts, 78 inch pounds), that's only about 5 foot pounds. If they're using a 3/8" ratchet and a 10mm socket, it's extremely easy to overtorque these things, and they only go into aluminum.
3. Running the trans pump dry can heat it up very quickly and damage it. It uses the fluid to cool itself too, so running it dry is bad, so you'd better be quick in shutting it off or you can get shavings in your pump. Since the pump is after the filter, that means getting the potential shavings into your torque converter. No bueno.
4. "Stealerships" (gawd I hate that ****ing term) use a positive displacement fluid transfer device. The old fluid goes into an empty bag, which is next to a full bag of fresh fluid that contains more fluid than what your truck needs. They also, typically, put in a trans conditioner (I like BG products, but dealerships vary by area) that's mixed with the new fluid. These two bags are in a confined space. As the old fluid is pushed in, it pushes the new fluid back into the transmission. Before any of this happens, they'll put in a trans clean/flush product that will break loose the sludge and materials that have settled in various places around the transmission and drive the truck through all of the gears, over a certain period of time (different products have different times they want to have the product in there) and then do the flush.
I've done hundreds of the flushes personally. I like BG products, personally. I won't do a drain and refill, even several over a period of time, because the fluids just mingle too much and it does nothing for the materials that have built up inside the trans. It would be like running a carb that needs rebuilt do to sludge and contamination by just running new fuel through it, without a cleaner. If you flush a carb, with a good cleaner, then run fresh fuel through it, it does a ton better (bad comparison because you can simply rebuild a carb, not so easy for an automatic transmission, but you get the gist.
Kris, get a flush, with a cleaner and conditioner and don't look back. There are several folks that have decent luck with the drain and fills or the po'boy flushes. But really, I wouldn't waste the time on it and your truck is worth a lot of money to be rolling the dice with.
Stealerships. Really guys?
