The 3 means it’s a 2003 model year unit
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The G below the 3 means it’s the 5L40 family. A 5L50 would have the letter Z
XG is the alpha code for the L322. The BMW E53 with the M57 engine, for example, has the alpha codes XF and XW
96024237 is the GM part number for the transmission
Q01 is the calibration code (i.e. 2001 spec.)
The TCM box would give the week of remanufacture if the transmission was a genuine factory reconditioned unit and, in that case, the ‘Q’ would have been an ‘R’ followed by the year of re-manufacture
The serial number is a sequential number. You can see in the photo above that my example was a much earlier unit with a s/n of 714,599 whereas yours is 1,663,649
Phil
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