On my 2004 Cadillac Escalade EXT, the KC4 Heavy Duty Engine Oil Cooling can been seen as a set of oil cooler lines going from a set of ports on the oil pan right above the engine oil filter to a set of ports on the left side radiator tank.
The KNP Cooling System Trans, HD cooler is a small horizontal radiator looking device that sits horizontally in front of the a/c condenser in front of the radiator and can be seen right behind the front grill.
The transmission fluid is routed first through the transmission cooler in the right side radiator tank, then is routed through the auxiliary cooler up front before returning to the transmission.
Some have added an aftermarket auxiliary transmission cooler on trucks that do not have the factory installed device and have also replaced the rather smallish factory cooler with a larger aftermarket device for better transmission cooling.
The
Tru-Cool - Max LPD47391 47391 Low Pressure Drop Transmission Oil Cooler is one such aftermarket cooler that seems to be pretty popular.
There are several Youtube videos describing the installation of this cooler.
On my EXT, with the factory auxiliary cooler, the transmission temperature generally runs 90 degrees above the outside air temperature all year round under normal driving.
In the heat of summer, while running the a/c and towing my 25' Party Barge, the transmission temperature will run 10-15 degrees above that.
My 2003 Avalanche Z-66, with no factory auxiliary transmission cooler installed, usually runs around 195-205 degrees under normal summertime driving.
I have not yet towed my Party Barge with that truck.
I also have the aftermarket cooler I mentioned above purchased and ready to install in that truck, when I get around to it.
I wanted to have that cooler ready to install when and if my factory original transmission needs a rebuild.
The transmission in that truck has never been rebuilt and currently has 246K miles on it.
It's bound to go out at some point, I would assume.