[cleszkie]

If you are not going to be really taxing your tranny by towing, I would just use the heat exchanger in the radiator as others have recommended. The engineers at GM knew what they were doing and designed it to perform.

Another thing to consider when stacking a tranny cooler with your A/C condenser is that it will decrease flow through the condenser and add radiant heat to it. These two things will ultimately decrease the efficiency of your condenser and result in slightly warmer air at the vents in your cab.

Lastly, if you absolutely feel you need an additional oil cooler of some sort, there are the long copper tube coolers with radial fins that you can replace sections of your existing hard lines with. They will not be located in front of your radiator, but would be exposed to air flow under the truck. The fins act as heat sinks and cool the ATF as it runs through. You would run this type of oil cooler in line with the heat exchanger in the radiator. I have seen this done on many trucks.