Buy OEM 2009 General Motors Part # 23182018 (22781135, 23214433). Suspension Control Arm (Rear, Lower). LaCrosse. W/AWD, rear. Suspension Control Arm - Repair or Replace Control arms often don’t fail

Arm. Control.
Extended Wheelbase. Suspension component that connects and provides pivotal movement of the Steering Knuckle to the vehicle. Assembly - Suspension. BushingS. Cntl. Inner Bushing. Included with: Lower Control Arm.

Suspension Control Arm

Fits LaCrosse, XTS

LaCrosse. W/AWD, rear.
Suspension Control Arm - Repair or Replace
Control arms often don’t fail on their own, although their associated bushings can break or wear causing a clunk noise when your 2009 goes over bumps or changes speed rapidly—whether braking or under hard acceleration. Control arms can also sometimes become bent, causing your vehicle to pull to the left or right.