Delphi TL478 Steering Idler Arm

Delphi Steering Idler Arm TL478 Overview

The Delphi TL478 Steering Idler Arm is a forged, durable replacement part designed for select Cadillac, Chevrolet, and GMC trucks and SUVs. Engineered to meet standard replacement specifications, this steering idler arm ensures reliable performance and precise steering control for vehicles like the Chevrolet Tahoe and GMC Yukon.

• Forged construction for strength and durability
• Pre-greased and greaseable design for easy maintenance
• Includes castle nut, cotter pin, and grease fitting
• Standard replacement grade for reliable fit and function
• Compatible with multiple Cadillac, Chevrolet, and GMC models

Durable Construction and Key Features

The TL478 steering idler arm is crafted from forged material, providing enhanced strength to withstand the rigors of steering system demands. Measuring 142.0 mm (5.59 inches) in length, it features a black finish for corrosion resistance. This part comes pre-greased and includes a grease fitting, allowing for ongoing lubrication to extend service life. The arm stud thread diameter is 0.563 inches (14.28 mm), and the package includes a castle nut and cotter pin to secure the installation properly.

Compatible Vehicles and Applications

This Delphi steering idler arm is compatible with a range of full-size trucks and SUVs, including the Chevrolet Blazer, C1500, C2500, C3500, Tahoe, and Suburban models, as well as the GMC Yukon and Sierra series and Cadillac Escalade. The TL478 part number ensures a precise fit for these vehicles, maintaining proper steering geometry and control.

Common Issues Addressed by the TL478 Steering Idler Arm

• Eliminates excessive steering play or looseness
• Resolves uneven or unstable steering response
• Prevents premature wear in steering linkage
• Corrects steering wheel vibration or shimmy
• Restores proper alignment and handling

Installation Notes and Tips

Installation of the Delphi TL478 steering idler arm requires standard hand tools and basic mechanical knowledge. The included castle nut and cotter pin ensure secure fastening. Since the part is pre-greased and greaseable, apply additional grease through the fitting after installation to maintain optimal performance. Always verify compatibility with your specific vehicle model and year before installation.

Quality Assurance and Warranty

Delphi manufactures the TL478 steering idler arm to meet or exceed OEM standards for fit, form, and function. This standard replacement part undergoes quality inspections to ensure durability and reliability. While specific warranty details may vary, Delphi typically offers coverage against manufacturing defects to provide confidence in your purchase.