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18 Before installing a converter onto the input shaft, it's a good idea to fill it with ATF. We were able to fit 2 quarts of TCI Max Shift full synthetic trans fluid by diagonally tilting the converter. Not shown (but necessary when switching from a TH350 to a TH400) are 1/2-inch-longer converter-to-flexplate fasteners. We found them listed in the TCI catalog under the following part numbers: 745501, Grade 8 nut and bolts, 7/16-inch-20x1-1/2-inches long, 3/pkg.