300M Ultra High-Strength Steel • Rolled Splines
The Sonnax Extreme Heavy Duty Intermediate Shaft is engineered for high-torque diesel and performance transmission builds where stock shafts become a known failure point. Manufactured from 300M ultra high-strength steel and finished with rolled splines, this shaft delivers exceptional durability, fatigue resistance, and fracture strength under extreme load.
Rolled splines improve the grain structure of the material, significantly increasing spline life and resistance to twist or shear compared to cut-spline designs. Combined with Sonnax’s precision manufacturing standards, this shaft is built to survive aggressive tuning, heavy towing, and high-horsepower applications.
Sonnax Extreme Duty Design
Manufactured from 300M ultra high-strength steel
Rolled splines for increased durability and fatigue resistance
Superior torsional strength vs. OEM and cut-spline shafts
Precision machined for proper fit and clutch engagement
Designed for high-torque diesel, towing, and performance builds
Direct replacement for OE intermediate shaft
Built and performance transmission builds
Heavy towing and work trucks
High-horsepower and tuned applications
Preventing common intermediate shaft twist or spline failure
This Sonnax intermediate shaft is a proven upgrade for builders who demand reliability, strength, and long-term durability in extreme operating conditions.
please note this one does NOT require machining.
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