The 2021 Ford Bronco gets its off-road prowess in part from an available crawler gear. But why is that feature such a big deal, and how does it work? Jason Fenske of Engineering Explained has the details.
Denoted by a “C” on the Bronco’s manual-transmission shift pattern, the crawler gear is a first gear with an even higher ratio, Fenske said. In the Bronco, the crawler gear has a ratio of 6.588:1, compared to 4.283:1 for first gear. That allows for more wheel torque, albeit with a lower top speed. They don’t call it a crawler gear for nothing.
As with any four-wheel drive vehicle, that effect is amplified by the gearing of driveline components. The more aggressive of the Bronco’s two available transfer cases offers a low range of 3:06:1, while the most aggressive option for the rear differential on manual-transmission Broncos is a final drive of 4.7:1, on