I received clarification on the differences. It appears that GM #3964255 is the correct oil pump that I need to located for the GM Deep Oil Pan #3879633.
GMPARTSWIKI lists the following description for the associated part numbers.
#3964255 Pump ASSY. (Oil) (Deep Oil pan Only)
#3946023 Pass. 396, Pump ASSY Oil
Thanks !
Last edited by 68 DANA; 01-15-2019 at 01:59 AM.
Reason: Added Description
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