This is pretty much my original plan. Others have planted the seeds of doubt though. Do you find that the trans takes much longer to come up to temp than the engine?
Bill over at TCI told me that if the transmission runs too cold, it is hard on the pump assembly, at the time we were talking Turbohydramatic 400. We installed hardened pump rings and opened up the oil return ports to minimize foaming.
In the motor home, the temp follows the engine temp on warm up and seems to stay at about 10 degrees warmer than the water temp. This is a 400+HP fuel injected 454 and the motor home tips the scales at a pretty svelte 18,000 pounds, so not real heavy and plenty of HP.
It was driven across Montana a few years ago and according to the GPS, went across the plains at over 90MPH.....
Putting the air side cooler first is the way I have always done it, never had one get hot.
GT