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If both trucks are 96 or newer, you need to use the flexplate for a 5.9 on the 5.9 engine. It is externally balanced, and the weights are on the flexplate.
You have a 46RE trans, so, pretty much any other 46RE from 96 to 99 trucks/vans (that are also RWD) should bolt right in, and hook right up. Doesn't matter which engine it is behind. (5.2 or 5.9, but, NOT the 3.9)