MOOG K400018 Idler Arm Assembly for 2011-2019 Chevy Silverado GMC Sierra 2500HD

Vehicle Fitment

• 2011-2019 Chevrolet Silverado 2500 HD (WT, LT, LTZ, High Country | 6.0L V8 Gas / 6.6L V8 Duramax Diesel | 2WD / 4WD)
• 2011-2019 Chevrolet Silverado 3500 HD (WT, LT, LTZ, High Country | 6.0L V8 Gas / 6.6L V8 Duramax Diesel | 2WD / 4WD)
• 2011-2019 GMC Sierra 2500 HD (SLE, SLT, Denali | 6.0L V8 Gas / 6.6L V8 Duramax Diesel | 2WD / 4WD)
• 2011-2019 GMC Sierra 3500 HD (SLE, SLT, Denali | 6.0L V8 Gas / 6.6L V8 Duramax Diesel | 2WD / 4WD)

Fitment Notes

• Includes mounting bracket - complete assembly ready to install without sourcing a separate bracket
• MOOG qualifier: "Design Allows Easier Installation" - engineered for more straightforward removal and installation than the OEM assembly
• Replaces GM OEM part numbers: 19258130, 84068279, 19256661, 23445899, 45C1131, 4501131
• Pair with MOOG K440019 (pitman arm) for a complete steering linkage refresh on both sides
• Sold individually - one idler arm assembly per package
• Verify fitment by year, engine, and drivetrain before ordering - confirm your specific sub-model is supported

Features

• Complete assembly includes the idler arm and mounting bracket - no need to source separate components for installation
• Powdered-metal Gusher Bearing design actively circulates grease through the bearing surface, reducing friction and extending service life under heavy-duty loads
• Engineered steel composition delivers a stronger, more rigid component than standard stamped steel OEM designs
• Greaseable socket allows fresh lubricant to flush out road contaminants, reducing corrosion and internal wear over time
• Pre-greased at the factory - ready to install out of the box with no additional greasing required before initial service
• Heavy-duty design suited to the sustained towing, hauling, and load demands of 2500HD/3500HD platforms
• Direct OE replacement - meets or exceeds factory specifications for fit, form, and function
• Backed by MOOG's limited lifetime warranty when professionally installed on catalog-listed applications

Specifications

• Part Type: Steering Idler Arm Assembly (with Bracket)
• Length: 157.0mm / 6.181"
• Material: Engineered steel composition
• Pre-Greased: Yes
• Grease Fitting Included: Yes
• OEM Cross-Reference: 19258130, 84068279, 19256661, 23445899, 45C1131, 4501131 (GM)
• Interchange: MS50914, IA90289, IA90289XL, 2683725
• Warranty: Limited Lifetime (professionally installed)

Included Components

• 1x Steering Idler Arm
• 1x Mounting Bracket

Product Description

The MOOG K400018 is a complete steering idler arm assembly for 2011-2019 Chevrolet Silverado 2500 HD and 3500 HD, and 2011-2019 GMC Sierra 2500 HD and 3500 HD, covering both gas and Duramax diesel configurations in 2WD and 4WD. The idler arm attaches to the frame on the passenger side of the vehicle, directly opposite the steering gearbox, and supports the center link to keep the steering linkage level and properly aligned. When it develops vertical play or wear, common symptoms include steering wheel shimmy, wandering or loose steering, and uneven front tire wear - all particularly noticeable on trucks that carry loads or tow regularly.

MOOG's K400018 stands out from basic OEM replacements with its powdered-metal Gusher Bearing that actively distributes grease through the bearing surface during operation, and an engineered steel composition that delivers greater rigidity than standard factory components. The assembly arrives complete with the mounting bracket and comes pre-greased, simplifying installation - MOOG's "Design Allows Easier Installation" qualifier reflects deliberate engineering improvements to the removal and replacement process on this specific platform. For a full steering linkage service, pair this idler arm with MOOG K440019 (pitman arm) to address wear on both sides of the system simultaneously.