Dorman 425-121 Steering Shaft - Lower Intermediate

Dorman Steering Shaft for Silverado and Sierra

Dorman 425-121 is a direct replacement steering shaft for specific Chevrolet Silverado and GMC Sierra heavy-duty applications. It is precision-machined for a secure fit and tested to meet Federal Motor Vehicle Safety Standards, making it a practical OE-style solution for steering repair.

Key Features

• Direct replacement steering shaft for selected lower intermediate steering applications
• Precision-machined steel construction with a painted black finish
• Internal profile end and thru-hole end design
• Includes one universal joint for the specified application
• Built and tested to meet Federal Motor Vehicle Safety Standards
• Fits 2017-2019 Chevrolet Silverado 2500 HD, lower intermediate, w/RPO Code NV8 (Variable Magnetic Speed Power Steering)
• Fits 2017-2019 Chevrolet Silverado 3500 HD, lower intermediate, w/RPO Code NV8 (Variable Magnetic Speed Power Steering)
• Fits 2017-2019 GMC Sierra 2500 HD, lower intermediate, w/RPO Code NV8 (Variable Magnetic Speed Power Steering)
• Fits 2017-2019 GMC Sierra 3500 HD, lower intermediate, w/RPO Code NV8 (Variable Magnetic Speed Power Steering)
• Fits 2017-2018 Chevrolet Silverado 2500, lower intermediate, w/RPO Code NV8 (Variable Magnetic Speed Power Steering)
• Fits 2017-2018 Chevrolet Silverado 3500, lower intermediate, w/RPO Code NV8 (Variable Magnetic Speed Power Steering)

Detailed Description

This steering shaft is engineered as a standard replacement for the lower intermediate steering position on select Chevrolet Silverado and GMC Sierra trucks equipped with RPO code NV8 Variable Magnetic Speed Power Steering. The steel shaft measures 390 mm in length and features a 30.45 mm diameter, with a black painted finish for corrosion-resistant appearance and serviceability. Dorman 425-121 is designed to restore proper steering connection where the original shaft has worn, loosened, or developed play. This part cross-references 84326268 for the same application.

What It Helps Fix

• Steering wheel looseness caused by wear in the lower intermediate shaft
• Binding or rough steering feel from a damaged shaft assembly
• Excessive steering play related to worn internal profile or thru-hole connections
• Noise or clunking from a deteriorated steering shaft joint
• Loss of precise steering response in Silverado and Sierra HD trucks

Installation Notes and Tips

Verify the vehicle’s RPO code NV8 and confirm the lower intermediate position before installation. Match the shaft length, end types, and mounting points to the original component, and inspect the surrounding steering linkage for wear before reassembly. Dorman 425-121 is supplied as a direct-fit replacement for the listed applications and includes the necessary mounting hardware for the specified installation.

Quality Assurance

Dorman tests this steering shaft to Federal Motor Vehicle Safety Standards and uses precision machining to support a tight, secure fit in the listed Chevrolet Silverado and GMC Sierra applications. The part is built as a standard replacement for dependable steering system service.