Moog K6390 Steering Idler Arm

MOOG K6390 Steering Idler Arm

The MOOG K6390 steering idler arm is built for classic GM truck and SUV steering systems that need stable linkage support and consistent road feel. It is pre-greased and includes a castle nut and grease fitting for serviceable maintenance.

Compatible with 1988-1992 Chevrolet C1500, C2500, C3500, K1500, K2500, and K3500, plus 1992 Chevrolet Blazer, Suburban, and GMC Yukon applications, this MOOG idler arm is a direct-fit steering replacement for many full-size GM platforms.

• Pre-greased for initial service readiness
• Castle nut included
• Grease fitting included for routine lubrication
• Heavy-duty construction for steering linkage support
• Length: 140.0 mm (5.512 in.)
• Mounting hole diameter: 60.5 mm (2.382 in.)

Fitment Details

• Fits 1992 Chevrolet Blazer, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 Chevrolet C1500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 Chevrolet C1500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 Chevrolet C2500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 Chevrolet C2500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 Chevrolet C3500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 Chevrolet K1500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 Chevrolet K1500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 Chevrolet K2500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 Chevrolet K2500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 Chevrolet K3500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 GMC C1500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 GMC C1500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 GMC C2500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 GMC C2500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 GMC C3500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 GMC K1500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 GMC K1500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 GMC K2500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 GMC K2500 Suburban, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1988-1992 GMC K3500, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.
• Fits 1992 GMC Yukon, N/A. Notes: Includes powdered-metal Gusher bearing to allow grease to penetrate bearing surfaces; heavy duty design includes frame bracket.

What It Helps Address

• Steering looseness in the idler arm linkage
• Uneven steering response on GM truck and SUV front ends
• Wear at the steering support point from age and mileage
• Service issues where a greaseable replacement is preferred
• Replacement needs for 1988-1992 Chevrolet C1500 and GMC K2500 steering systems

Installation Notes

Verify mounting hole diameter and overall length against the original part before installation. The included grease fitting supports routine lubrication after installation, and the pre-greased design helps simplify initial setup. This part cross-references Delphi TA2133 for the same application.

Quality Assurance

MOOG is known for chassis components that incorporate design updates aimed at longer service life and easier replacement. The K6390 follows that approach with serviceable lubrication features and OE-style fitment for the listed Chevrolet and GMC applications.