swapping early 3.09 1st into later case

Brad4406 said

Yes, it can be done and that is what I ran for years in my 71 Duster behind my 440. I also plan to run that same trans behind my 500 in my Barracuda, at least until I get a chance to install my T56. My best friend built it for me. He did exactly that, took the 3.09 from the early trans and put it in the late case.

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Hang-on
You're putting a 500 in a Barracuda, and you think you need a 3.09 low gear?
That 3.09 is a torque multiplier, to the tune of 3.09/2.66= plus 16%. We use it behind low-torque engines to help get them off the line.Or behind engines saddled with very low-perf. street gears.
Somehow I'm having trouble imagining a low-torque 500.....
or a 500 with 2.76 gears........