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Would it hurt anything if I don't?
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No, not a thing.
But filling the toque converter and the pan before you install the new tranny might hurt your back.
So don't do it.
Before you install the tranny/torque converter assembly, use an air compressor turned down to about 15 PSI and blow air in the cooler "hot" line. ATF in the coolers will come out the disconnected return line. If you didn't drain the tranny pan before you dropped the tranny, then do it now.
Then with no ATF in the tranny or torque converter or coolers, install the assembly and button it all up.
When you get done with the install, then pour 7 quarts of ATF into the filler (dipstick) tube. Then crank the engine and allow the engine to idle for about 30 seconds. That will fill the torque converter and the coolers. Then pour in another 6 quarts and crank the engine and let it idle for another 30 seconds. You now have 13 quarts of new ATF in the system. But there was some old ATF left in the tranny passages that won't drain, so figure on a total of around 14 quarts in there now, and it holds a little more than 17 quarts. So pour in another 3 quarts, to get it almost full.
Then drive about 30 miles unloaded or 15 miles dragging a heavy trailer, then check the ATF level when it's hot. Top off the hot tranny until it's full but not over full.
