Your favorite rear end/final drive ratio and why?

Dale Davies said

V8 Dakota 3.91 w/AOD is pretty much the tow package. My 2000 Dakota 3.9 w/AOD and 3.55 gears runs down the Hwy at 100KPH or 62MPH at about 1900 RPM.
Yup heavy tow in the 1 ton with OD off but the revs will be up there.
The New Yorker w/2.92 is good for a lux barge. That 413 just running nice at 80. Throw an OD trans in and probably run about 1600 or a bit more at that speed and get good economy doing it.

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Yep, the one ton 360 with 4.88 and 245/75-16 tires is turning 3600 rpm at 55. But it's worth it to tow the 14000-pound backhoe around the county. It's under all axle and 26000 restrictions. But way over what Dodge says it can tow. It don't care.

I don't think economy with the 1964 413 New Yorker is part of the program with any rear gear. It gets 16 at 70, no wind, no hills, good tune, stock carb. And to top it off, must use premium 93 gas.