Moog RK100138 Suspension Control Arm and Ball Joint Assembly - Rear Upper Rearward

OE-Style Rear Upper Rearward Control Arm

The Moog RK100138 is a rear upper rearward suspension control arm and ball joint assembly built for Lexus applications that need precise alignment control and stable suspension geometry. It is an adjustable, forged steel replacement with corrosion-focused construction for service on Lexus IS250, IS350, IS F, GS350, and GS300 models.

Key Features

• Forged steel control arm for structural strength
• Adjustable design with camber correction range of plus or minus 1.5 degrees
• Press-in ball joint mounting type with threaded ball joint stud
• Grease fitting included for serviceability
• Bushings included with rubber bushing material
• Engineered for corrosion protection and OE-style replacement fitment

Detailed Description

Moog RK100138 is a rear upper rearward control arm assembly for the rear suspension on select Lexus vehicles. It is built from forged steel and includes rubber bushings, a press-in ball joint, and a grease fitting to support long-term suspension service. This part number is commonly searched as RK100138 for Lexus IS250 rear upper rearward control arm replacement, Lexus IS350 rear suspension control arm replacement, and Lexus GS350 rear upper rearward control arm assembly. It also cross-references Mevotech Supreme CMS861206 for the same application.

Compatible With 2006-2015 Lexus IS250, rear upper rearward; 2006-2015 Lexus IS350, rear upper rearward; 2008-2014 Lexus IS F, rear upper rearward; 2007-2011 Lexus GS350, rear upper rearward; and 2006 Lexus GS300, rear upper rearward. The adjustable design helps restore rear suspension alignment after wear or component replacement, especially where camber correction is needed.

What It Helps Address

• Rear suspension looseness or play from worn control arm components
• Camber alignment issues after suspension service
• Clunking or noise from deteriorated bushings or ball joint wear
• Uneven tire wear related to rear suspension geometry
• Restoration of rear upper rearward suspension control on Lexus IS and GS models

Installation Notes and Tips

Install RK100138 on the rear upper rearward position only for the listed Lexus applications. Because the ball joint is press-in and the arm is adjustable, final alignment should be performed after installation. Verify vehicle year, model, and rear suspension configuration before ordering. The grease fitting allows routine lubrication during service intervals.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection, with OE-style replacement intent for foreign and domestic nameplates. Part number RK100138 is built to meet the demands of rear suspension service on Lexus IS250, IS350, IS F, GS350, and GS300 applications.