Billet Input Shaft

Features:

• Fits 1994–2010 Dodge RAM 2500 and 3500
• Designed for 5.9L and 6.7L Cummins engines
• Heavy-duty 27-spline billet construction
• Handles extreme torque and load abuse
• Requires custom torque converter compatibility
• Ideal for high-performance or competition builds
• Far stronger than standard billet input shafts
• Reduces risk of shaft failure under stress
• Precision machined for tight tolerances
• Tested in drag, sled pull, and street builds
• Essential upgrade for built transmissions

When You Refuse To Let Your Transmission Be The Weak Link

If you're building serious power and expect your Cummins to hold up under punishing conditions, the SunCoast 618-27 Billet Input Shaft is one upgrade you can't afford to skip. This isn't your average billet shaft, it's a proven solution for trucks that push the limits at the track, on the dyno, or hauling heavy loads across unforgiving terrain. Whether you're chasing big boost numbers or just need peace of mind when you lay into the throttle, this shaft is built to take abuse where others fail. The 27-spline design delivers an extra level of strength over stock-style input shafts, making it a go-to for serious performance enthusiasts and competitive diesel owners alike. It's the kind of component you install when you're tired of breaking things and want to do it right the first time. Pair it with a custom torque converter and your transmission becomes a whole different animal, ready to hold torque you never thought possible. This is for the guys who don’t want to slow down, back off, or give up just because the factory parts can’t hang.

Precision Machined Strength Where It Matters Most

SunCoast’s 618-27 Billet Input Shaft is engineered with durability and torque resistance at the forefront. Unlike conventional billet shafts that replicate factory spline counts, this proprietary 27-spline design increases contact surface area for better power transfer and reduced stress concentration. Built from high-grade billet steel and machined with tight tolerances, this input shaft is designed to handle torque loads that would twist or shatter lesser components. It's been torture-tested in real-world scenarios like sled pulling, drag racing, and heavy towing, proving its strength time and time again. The shaft does require a custom torque converter due to its unique spline count, but that’s part of what makes it so bulletproof under extreme load. It's not just about stronger materials, it’s about smarter design, made to prevent failures at one of the most critical stress points inside your automatic transmission. For diesel owners pushing past stock limits, this input shaft is the foundation for a truly reliable high-performance build.

Fits: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Dodge RAM 2500/3500 5.9L/6.7L 2500/3500 Cummins

Notes:

• Designed for 1994–2010 Dodge RAM 2500/3500 with 5.9L or 6.7L Cummins engines.
• Proprietary 27-spline design offers greater strength than stock input shafts.
• Requires a custom torque converter to match the 27-spline input.
• Not compatible with factory or stock-style torque converters.
• Recommended for high-horsepower or high-torque applications.
• Ideal for racing, sled pulling, or heavy-duty towing builds.
• Professional installation is strongly recommended due to precise tolerances.
• One of the most failure-prone areas in a high-power build — this shaft addresses that weak point.
• Should be paired with other upgraded transmission components for best results.
• Engineered and tested by SunCoast for extreme durability under load.