Moog RK90423 Suspension Control Arm and Ball Joint Assembly - Front Left Upper

OE-Style Front Left Upper Control Arm

Moog RK90423 is a front left upper suspension control arm and ball joint assembly for select Chrysler Crossfire and Mercedes-Benz models. It is built with stamped steel construction, pre-greased components, and corrosion-focused engineering for direct replacement service on the front suspension.

Key Features

• Pre-greased for immediate service
• Stamped steel control arm construction with black finish
• Rubber bushings included for suspension isolation
• Press-in ball joint with threaded stud design
• Mounting hardware included
• Non-adjustable OE-style replacement for front left upper applications

Product Details

Moog RK90423 is engineered for structural strength and corrosion protection, making it a practical replacement for worn front suspension components on the Chrysler Crossfire and Mercedes-Benz C-Class, CLK-Class, E-Class, and SLK-Class platforms. This front left upper control arm assembly is designed around OE-style dimensions and service requirements, with bushings included and a pre-greased design to support straightforward installation and dependable suspension geometry. This part cross-references Delphi TC2044 for the same application.

Compatible With 2004-2008 Chrysler Crossfire, front left upper; 2004 Mercedes-Benz SLK230, front left upper; 1998-1999 Mercedes-Benz SLK230, front left upper; 2004 Mercedes-Benz SLK32 AMG, front left upper; 2001-2004 Mercedes-Benz SLK320, front left upper; 2003 Mercedes-Benz CLK320, front left upper; 1999-2003 Mercedes-Benz CLK430, front left upper; 2003 Mercedes-Benz E320, front left upper; 2000-2003 Mercedes-Benz SLK230, front left upper; 2002-2003 Mercedes-Benz SLK32 AMG, front left upper; 1998-2002 Mercedes-Benz CLK320, front left upper; 2001-2002 Mercedes-Benz CLK55 AMG, front left upper; 1996-2002 Mercedes-Benz E320, front left upper; 2000-2002 Mercedes-Benz E430, front left upper; 1999-2002 Mercedes-Benz E55 AMG, front left upper; 1999-2000 Mercedes-Benz C230, front left upper, with Sport Package; 1994-2000 Mercedes-Benz C280, front left upper, with Sport Package; 1998-2000 Mercedes-Benz C43 AMG, front left upper; 1998-1999 Mercedes-Benz E430, front left upper; 1997-1998 Mercedes-Benz C230, front left upper; 1996-1998 Mercedes-Benz E300, front left upper; 1996-1997 Mercedes-Benz C36 AMG, front left upper, with Standard Suspension; 1997 Mercedes-Benz E420, front left upper; 1994-1996 Mercedes-Benz C220, front left upper; 1995 Mercedes-Benz C36 AMG, front left upper.

What It Helps Address

• Front-end looseness or wandering from a worn upper control arm
• Clunking or knocking from deteriorated bushings or ball joint wear
• Uneven tire wear caused by suspension geometry issues
• Steering response problems related to worn front suspension joints
• Ride quality loss from fatigued rubber bushings

Installation Notes

Verify the vehicle’s exact year, model, and suspension configuration before installation. This assembly uses a press-in ball joint with a threaded stud, so proper suspension service tools and alignment procedures are recommended after replacement. Confirm front left upper placement and compare the original part to the new assembly before bolting it in.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection, with OE-style service fitment for foreign and domestic applications. RK90423 is built to meet the demands of front suspension replacement on Mercedes-Benz and Chrysler platforms.