The whole thing drum-to-drum
But you have to check for the N on top and the casting number to get in that range.
Would also need to be a clean part with minimal pitting and an internal inspection.
Rusty pitted dirty with unknown condition internally won't bring those figures.
I have a 68 3.55 posi and a 70 3.55 posi - neither with N casting
it makes a difference
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