What Differential Do You Have in Your 1965 Barracuda?

4mulas said

I had one of the very first 1966 production formula S car’s, number 00521 of the assembly line built in September of 1965, and it came with a suregrip 3.23 ratio 7 1/4" diff. I Think that it could have come with a 8.75 if a box was ticked or if they weren’t trying to use up 7.25 sure grip units.

most of if not all later production S cars for the 66 year received 8.75" units

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Mine is #499 (Aug 17, 1965) from the Hamtramck plant and has an 8 3/4 behind a 273/4 and an 833. Where was yours first sold? Mine is an original Hawaii car. I've been looking for an earlier '66 Barracuda for over 40 years now and still haven't found one. Yours is the closest however, even though I would have thought it would have been an August build with that number. Maybe yours is an LA plant car?