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Torque converter is weak chain link on these transmissions. You will be taking it off together with the gearbox anyway. Besides, there could be inside some debris and metal particles too. If you don't want to take off transmission in near future again, I would strongly recommend to do torque converter as well. This is normal practice. You cant open it yourself. You need to take it off and send to someone, who can professionally cut it, restore everything inside, weld it back and balance. I have contacts here in UK (cost me 250 GBP), but in Norway there must be some companies too. Yes, you need to wash somehow your cooler as well. You obviously cant use the water. I don't actually know how you can flush it properly. Maybe with diesel fuel, but it is messy job. Theoretically, filter should have been keeping all the metal particles, but you never know. There could be aluminium dust as well. Personally, I have replaced my original cooler with Chinese aftermarket one, which I bought on e-bay for 40GBP. I have attached it to the original cooler with clips, there is enough space. Have done about 10 th. miles and it is working very well, oil temperature was never higher than 80C. Had to modify pipes connections though.