727 Trans Fluid Capacity

rally said

Can someone explain why would I ruin the front pump if I bolt converter to flexplate first then hook it to the engine?

Because there are 2 sets of splines and a set of lugs to align. There's no possible way you can align all 3 by first bolting it to the engine and trying to install it.

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Regarding to fishy68, I have to install the converter first then bolt to the engine. I dont get this, if do it this way, how do you tight the 4 flexplate lug to the converter?

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When you bolt the engine to the trans. you align 1 of the converter bolts and install it then rotate the engine over with a large ratchet or breaker bar until the next one comes into view, install that bolt and so forth. Note that they are not evenly spaced so before you install the flexplate on the engine hold it up to the converter and align the bolts and mark it so when you get the engine bolted up all you have to do is align your mark and bolt it up.