TrailBeast said

I think it's probably 2.73:1 gears in a 7.25 rear end.
That's what my 73 has in it, but it's possible you have an 8.25.
I went from 17-18mpg to 25 when I changed to an OD trans and left the rear gears.
(hiway car, not a racer of any kind)

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