Upgrade your classic GM K-series truck with the unmatched strength and smooth performance of the RCV Ultimate Dana 44 CV Axle Set. These high strength CV axles replace the factory U-joint shafts, eliminate binding, increase articulation, and deliver twice the strength of OEM shafts.

Traditional U-joints lose strength and bind under steering angle, especially with larger tires or lockers. RCVs constant velocity design maintains full strength at every angle, giving your K10 or K20 smoother power delivery, tighter steering feel, and dramatically improved durability on- and off-road.

IMPORTANT NOTE: All CVJ44OS axle kits require a 30 spline hub gear upgrade. RCV hub gears are compatible with Warn 20990 Premium Lockouts.

Includes:

• Left & right RCV CV axle shafts
• 30 spline outer stubs
• SST seals & installation tool
• Synthetic moly grease
• Installation hardware
• Installation instructions
• Black oxide coating (standard)
• Optional nickel plating available

Specifications

• Axle Model: Dana 44
• Unit Bearing: No
• OEM Inner Spline: 30
• OEM Outer Spline: 19
• RCV Inner Spline: 30
• RCV Outer Spline: 30 (requires 30 spline hub gear upgrade)
• Left Inner Axle Length: 36.31
• Right Inner Axle Length: 18.31
• Outer Stub Axle Length: 9.94
• Boot Technology: RCV bootless, sealed joint design
• Warranty Note: Warranty is void over 40" tires

Fitment

Fits GM full-size trucks equipped with a Dana 44 front axle:

• Chevrolet K10 19711981
• GMC K15 19711981
• Chevrolet K20 19711981
• GMC K25 19711981

Requirements:

• Upgrade to 30 spline hub gears
• Compatible with Warn 20990 Premium Lockouts
• Not compatible with factory 19 spline lockouts unless upgraded.

Tech Insight

Classic GM Dana 44 trucks rely on 19 spline outer shafts and U-jointstwo major weak points when adding engine torque, running larger tires, or installing lockers. RCVs upgrade solves both:

• 30 spline outer conversion = stronger hub interface
• CV joint = full torque at any steering angle
• Smoother, bind free articulation
• Dramatically increased strength and reliability

For K-series trucks frequently used off-road or modified for power, the improvement in durability and drivability is significant.