How hard is it to change ratios in an 8-3/4"?

"You will probably be disappointed with the 2:76 one wheel wonder."

Toolmanmike, I am sure you are correct as far as acceleration is concerned, but what if I were totally unconcerned about it? What if I only cared about gas mileage and low freeway cruising RPM? (After all, when I wanted acceleration I could always re-install the 3.73.)