...the 1.5 qt value is only what's in the transmission pan, it's not the total fluid capacity which includes the torque-converter, which is where MOST of the fluid actually is (as Johnny Mullet stated).
...so, view the 1.5 qt value as a "DIY" pan-drop quantity, and the 5.2 qt value as a "total" draining operation (as the OEM dealer would perform).
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