How can I figure what gear ratio I want to use in the rear end of my truck?
When ordering or buying a truck or SUV, most buyers give little thought to some of the mechanical features of the vehicle. One item rarely considered is the rear axle ratio as many owners never intend to tow a trailer or pull a large bed/load of equipment. For most drivers, the axle ratio that is standard (from the factory) is suitable for ordinary use. Choosing an optional acceptable ratio may be of benefit even though it is a compromise.SignificanceThe final drive ratio of a rear differential can be selected to either improve pulling power or reduce engine speed relative to road speed. A numerically higher gear-set provides more leverage to the wheels, while a numerically lower set reduces the revolutions of the drive train from the drive shaft forward. If the goal is to perform more work with less effort, a gear ratio with a higher numerical value will multiply the force of the engine more, making it easier to climb hills or pull more weight. An example is a comparison between a 4:1
