I ran a 3.73:1 ratio from a Ford 3/4 ton in a mid-1970's Dana Type 60 housing for a GMC, and put it in a 59 Burb behind a SM-420 and a 307 V8. It pulled everything I chose to hook up to, including a 22 foot 2-axle camp trailer, or a big Case farm tractor and all the accessories such as a plow, grader box, disc, and a few other implements, and still kept up with traffic on the interstate. Unloaded and carrying the family around, it got pretty decent gas mileage, also. if a ratio like that was available for the Chevy 3/4 ton axles, it would be just about ideal.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!