What are you currently using for a transmission cooler, and is it adequate in IT'S current configuration...WILL it work in an upgrade turbo choice.
You might want to post it here for scrutiny also. (or not)
It is quite possible that it contributed to your dilemma.
Very good point. Here is what I know about the current setup - the transmission oil flows through a heat exchanger mounted on the back bulkhead, where coolant flows in from a pipe that emerges from near the lower exhaust manifold, and then from the heat exchanger it dumps into the top of the radiator.
I can get a picture of the heat exchanger tomorrow and post it - I have no idea how to judge whether or not it is up to the task.