8 3/4 gears

I think 2.94 was a pretty common ratio for standard 8 3/4, at least in 66/67, but that would be a 741/742 case.

Are you sure about that 2007 factory ratio?

The past 20+ years, the thing to do has been a fairly low rear gear with o/d trans for a final drive in the 2.7x range.