D6R torque converter going out?

The transmission temperature on my D6R has been running hot the last 1000 hours or so. On a 80-90 degree day it will get up just under the red within half an hour and then the coolant temperature will follow it. I will stop wait for 15 minutes half throttle and it will go down, but it climbs right back up. It also has more of a hesitation going forward to reverse than I think it used to. I also think it may slip the converter a little under a heavy push. The radiators were replaced recently except for the oil cooler in the center. Before I drop the converter out is there anything I should try first? The machine has 15,000 hours on it and I've only had it for the last 2,500.