The ratio means that the drive shaft turns that number of times for each full rotation of the wheel on the ground. If you have a 4.10 Rear End the drive shaft turns 4.1 times for the wheel to roll one revolution forward (or backwards). If you have the 3.08 rear you almost get 25% further with the same number of drive shaft revolutions. The trade off is torque and force placed on the gears. If you are built for distance a heavy load may damage the drive train.
You used to have options when you ordered a truck or tow vehicle. Most manufacturers now build to suit features and the GM approach of satisfying the EPA milage requirement seems to be more important than choices. It takes research and knowledge to make the appropriate choices. Thanks for the heads up LIForrelaxin!
Happy New Year all!
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