Now that you have a clean pan, reinstall the gasket (or install a new one). I installed a new one since it came with the kit. I will probably change the fluid again in about 10,000 miles since I don't have a way to flush the torque converter, therefore I'll save some money and buy just a filter and reuse this new gasket next time.
I know its kind of old school, but I always put a thin film of grease on each side of the gasket to be sure there is a good seal. Opinions of this technique will vary.
Your filter should come with a new rubber o-gasket - just push the new filter on. It will hang just slightly at an angle (this is really crappily designed).
Then reinstall the pan, tighting the bolts evenly. I always do a cross tightening sequence. Since the gasket has the metal sleeves in it that prevent over tightening, a torque wrench really isn't necessary.
Here is my pan reinstalled:
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