Introduction:
Once you start modifying your truck for off-road you eventually get to the point where you want to modify your gearing. This page will help you figure out what gears you need when adding larger tires, how to calculate a gear ratio, or calculate your final crawl ratio.
Calculators:
Also check out Gear Ratio & RPM Guide For Larger Tires.
Jim Oaks is the founder of TheRangerStation.com, the longest-running Ford Ranger resource online since 1999. With over 25 years of hands-on experience building and modifying Ford Rangers — including magazine-featured builds like Project Transformer — Jim has become one of the most trusted authorities in the Ford off-road and enthusiast space. In 2019, he was loaned a Ranger FX4 by Ford Motor Company to test and document across the TransAmerica Trail. Jim continues to inspire and guide Ranger owners around the world.