Vehicle speed (mph), engine speed (rpm), tire diameter (inches), trans gear ratio, and rear axle gear ratio are all interrelated. If you know four out of five of these values, you can determine what ...

Building your 4x4 can be one of the most enjoyable and rewarding adventures that you will ever take. While we understand that not everyone is a master fabricator, simply getting to know the basics of ...

It is true, the sport of four-wheeling starts out innocently enough with a basic rig and some basic trails-that is, until you get the itch for some more ground clearance to tackle those tougher trails ...

The axle connects two or more of a vehicle's wheels to the same axis, whether on the front or back, and depending on how it's configured, the performance of your ride can vary greatly. Furthermore, ...

Few vehicle modifications have as major an impact as changing gear ratios, and it's because your car's gear ratio directly translates to how it delivers power. Think about it: The gear ratio, or how ...

What's the deal with the Jeep Wrangler Rubicon's four-to-one (4:1) transfer case? What about those 4.10 gears in those beefy Dana 44 axles? Why is it that when people put bigger tires on their ...

We need to choose the correct gear for our particular racing and track configuration, and we need to maintain that overall ratio when we make changes. Finding the right gear ratio for a particular ...

The optimal gear ratio depends on how the engine fits the intended use of the boat. Courtesy Yamaha In every boat test we run, we include certain specs that we feel are valuable to our readers. Some ...