RING AND PINION

The Dana 25-513366 is a Spicer Select differential ring and pinion gear set featuring a 4.33 gear ratio. It is designed to work with various Dana axle models including RSP/RDP40, 41, 17/19/21/22060S/D, and the RS/RA/RD 344, 404, 405, and 454 series.

This gear set includes a 9-tooth pinion and a 39-tooth ring gear with a 15.4-inch ring gear diameter. The package includes the necessary pinion nut and cotter pin for installation. It is manufactured in Mexico and is a core component for heavy-duty commercial axle assemblies used by major truck manufacturers.

Professional installation is recommended for differential gear sets, requiring precise setup of backlash and contact patterns. Users should ensure compatibility with their specific axle housing and carrier configuration before purchase, as these parts are axle-specific rather than vehicle-specific.

As a high-performance or heavy-duty drivetrain component, it is designed for durability under load in commercial applications. Users are encouraged to follow established break-in procedures to ensure longevity of the gear set.