Regear the differential in your 2003-2004 Dodge 5.9L Cummins with an all-in-one kit. To suit your particular requirement, these kits are offered in a vast array of gear ratios to suit your vehicle needs, gear ratio, and tire sizes. The races, seals, bearings, and ring & pinion set you need for installation are included with these kits. Find top-tier manufacturers such as Nitro Gear & Axle and Yukon Gear & Axle.