Dana S111 Ring and Pinion

Dana S111 ring and pinion gears are heavy-duty upgrades built for commercial and vocational trucks that require serious torque and durability. The Dana S111 axle — most commonly found as the rear axle in 2008–2018 Ram 4500 and 5500 trucks, along with various Ford F-450/F-550, GMC, and Dodge medium-duty delivery, construction, and vocational vehicles — features a large 12.25" (311 mm) ring gear, 34-spline pinion shaft, dropout-style 3rd member design, and 12 ring gear bolts for exceptional strength and easy service.

The ratios available on this page (4.11, 4.44, and 4.88) are ideal for compensating for larger tires, restoring low-end power, improving acceleration under load, or optimizing crawl performance in towing and off-road commercial applications. High-quality aftermarket sets from brands like Yukon Gear, Revolution Gear, USA Standard Gear, Motive Gear, or genuine Spicer fit the Dana S111 precisely but require a master install kit (bearings, shims, seals) for accurate backlash, preload, and contact pattern to ensure quiet, long-lasting operation.

Pairing these gears with upgraded axle shafts, heavy-duty bearings, or differential covers helps the Dana S111 handle increased torque and abuse reliably within its medium-duty capacity rating. Whether you're re-gearing a Ram 4500/5500 for better towing performance, strengthening a Ford or GMC medium-duty work truck, or maintaining a commercial fleet vehicle, browse our Dana S111 ring and pinion sets to find the ratio and quality that matches your project.

Dana S111 ring and pinion gears are available in ratios: 4.11, 4.44, and 4.88.