Dorman 425-344 Steering Shaft

Reliable Steering Shaft for Ford Fusion and Lincoln MKZ

The Dorman 425-344 steering shaft is engineered to provide precise steering control for select Ford, Lincoln, and Mercury vehicles. Designed with durable steel construction and universal joint integration, this steering shaft ensures consistent performance and fitment for models like the Ford Fusion, Lincoln MKZ, Mercury Milan, and Zephyr.

• Constructed from high-strength steel for durability
• Diameter of 0.67 inches for accurate fit
• Dual spline counts: 18 and 35 splines for secure connection
• Length of 11.5 inches to match OEM specifications
• Includes one universal joint for smooth steering articulation
• Black finish for corrosion resistance
• Comes with one steering shaft and one bolt
• Compatible with Ford Fusion, Lincoln MKZ, Mercury Milan, and Zephyr

Detailed Product Description

The Dorman 425-344 steering shaft is a critical component in the steering system, connecting the steering wheel to the steering gear. Made from steel, this shaft offers strength and longevity under normal driving conditions. It features a diameter of 0.67 inches and a length of 11.5 inches, matching the original equipment dimensions for proper fitment. The shaft has two spline counts—18 and 35 splines—on its ends, with one end featuring an external spline and the other an internal spline, ensuring a secure and precise connection to the steering column and gear. The included universal joint allows for smooth transmission of steering input even when angles vary, maintaining responsive handling. The black finish helps resist corrosion, extending the service life of the part.

Common Applications and Issues Addressed

• Replaces worn or damaged steering shafts causing play or looseness in steering
• Eliminates clunking or knocking noises during steering maneuvers
• Restores proper steering response and alignment
• Fixes steering shaft binding or stiffness due to joint wear
• Addresses vibration or shimmy felt through the steering wheel

Installation Notes and Tips

Installation of the Dorman 425-344 steering shaft requires basic mechanical skills and proper tools. The package includes one steering shaft and one bolt; however, mounting hardware and installation instructions are not included. It is recommended to verify spline alignment carefully during installation to ensure a secure fit. Lubricate the universal joint as needed to maintain smooth operation. Always follow vehicle-specific service manual procedures for steering system repairs to ensure safety and proper function.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 425-344 steering shaft undergoes quality checks to ensure durability and reliable performance. While specific warranty details are not provided, Dorman typically offers limited warranties on their replacement parts. Consult product documentation or the manufacturer for exact warranty terms.