I have an available '65 Pontiac rear, but a May '65 date code. I believe it is stamped for a 2.78 axle ratio IIRC.
Olds for sure and maybe Buick also apparently did share the same center casting.
9779822 is a Pontiac engineering issued part no. It is for the casting only and does not identify the Axle Tubes & Diff Housing assembly.
What I do not know is whether Olds (or Buick) used different axle tubes pressed into the center casting. So I cannot say if a '65 Olds Cutlass rear Housing is completely identical to the Pontiac. Possibly same Housing Assembly but different ring & pinion gears were offered, I just don't know anything about Olds to be sure.
The stamped codes will be different for sure but that is a trifling matter.
If all the dimensions are correct, then I would say it will work for you.
If you need dimensions to compare it to my Pontiac Housing just ask.
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