I would be willing to bet that they will install a fin cooler behind the radiator on your truck with the little tabs that push threw the radiator. All of this is BAD.
The finned coolers are not as good as the stacked plate coolers. Stacked plate coolers are more efficient and tougher. Stacked plate coolers can be had from Jegs or Summit for $45-75 ready to install with fittings, hose, clamps, etc.
Putting a tranny cooler behind the radiator is a waste of time. By the time the air gets to it to help cool the fluid it is already passed threw the radiator and gotten warmed up or the hot air inside the engine bay will be on it. Put a cooler infront of the radiator or it is pretty much a waste of time and money.
Using the little tabs that push threw the radiator is a very bad thing. Not only will the cool be sitting on the radiator (heat soak) but the little tabs will wear holes in your radiator cores and cause it to leak. Trust me I know from experience.
Make sure you get a good cooler from B&M or the like. The crap most of the auto parts stores sell is junk, even the stacked plate stuff. Also since you are in the AZ heat make sure to get the biggest damn cooler you can find. I have 2 coolers on my truck. Both B&M Super Coolers. One is an 18000lb cooler and the other is a 22000lb cooler.
Harley