Dodge-Cummins Diesel
Heavy Duty & High Performance Upgrades

Sonnax Dodge-Cummins diesel products deliver the best improvements available for this time-honored powerhouse transmission. Whether put to the test in a daily use workhorse or plow truck, or ensuring worry-free trips with a trailered truck pulling heavy loads, these dependable upgrades for Chrysler Dodge-Cummins diesel transmissions are the top choice for all high-quality builds.

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Keep Hardworking Trucks on the Road

When trucks with RFE transmissions are pushed to the GVW limit — or even when small amounts of power are added — the Overdrive clutch quickly surfaces as the weak link. Watch this video to explore the root cause of failure, and see how the groundbreaking Smart-Tech® overdrive clutch housing kit eliminates every clutch problem without relying on valve body/pump modifications – or adding the expense of extra components.

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HD Work/Sport Catalog

Take your heavy-duty gas & diesel builds to the next level with components for transmission, converter & driveshaft.

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Sonnax high performance products meet the toughest challenges faced by hard-working, daily-use drivetrains as well as racing units going all-out on the street or track.

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