The gear ratio of your truck’s ring and pinion plays a part in determining how fast you get up to speed, what that maximum speed is, and your fuel economy. Normally your OEM gear ratio is intended to provide a good balance between economy, acceleration, and top speed. By changing your gear ratio or “re-gearing” your truck, you can sacrifice some performance in one area for gains in others. Generally speaking, by moving to a numerically higher “short gear”, you’ll improve your truck’s acceleration at the expense of some top speed. To help you understand this process, some key terms are important to understand.