^^^ That's just too simple. Please go away
I'm sorry I ever made the correction in terminology, but I also did mention it really doesn't matter. On topic, it's power to weight ratio that determines the best ratio for any given vehicle. That and desired result. A farm truck, or even an urban taxi cab, will want a different ratio than a hiway hauler or commuter car. A farm pickup can run taller gears than the grain truck. Those USPS mail trucks built off of S10s are the 4cy/auto with no O/D and 4.10 posi. That was specific to the application for the perfect match. Them little puppies scoot on down the hiway to the far right but kick butt mailbox to mailbox through rain, sleet, and snow.