Cool, please report back with your results. Man I wish I had a SG now just for the trans temp readout.
Highest I saw the trans temp get was about 190 when I was going up a pretty steep, semi-long hill. It wasn't 4L steep, but it did cross my mind. Most of the time it seemed to be in the 170s. Quite a bit better than the previous trail runs of reaching 250 and makes me feel a lot better.