Dorman 527-177 Lateral Arm - Rear Left Upper Rearward

Dorman 527-177 Lateral Arm for Rear Suspension

Dorman 527-177 is a steel lateral arm built as a standard replacement for the original equipment part on select Cadillac and Buick rear suspension applications. It is precision-engineered and tested for reliable fitment on the specified vehicles, including rear left upper rearward positions.

Key Features

• Steel construction for suspension service applications
• Stamped control arm design
• Black bushings included
• Bolt-on attachment type
• End 1 and End 2 use bushing connections
• Standard replacement grade
• Compatible with Cadillac XTS rear left upper rearward applications
• Compatible with Buick LaCrosse rear left upper rearward applications with RPO Code GNE (H-Arm Rear Suspension)

Detailed Description

This Dorman lateral arm, part number 527-177, is made for rear suspension service where the original arm has worn bushings, looseness, or alignment-related movement. It is a steel, stamped replacement arm with bushings included and a bolt-on design for the listed applications. This part cross-references Mevotech Supreme CMS501252 for the same application. Fits 2013-2019 Cadillac XTS, rear left upper rearward, and fits 2013-2016 Buick LaCrosse, rear left upper rearward, with RPO Code GNE (H-Arm Rear Suspension). For buyers searching for a rear suspension lateral arm for Cadillac XTS or Buick LaCrosse, Dorman 527-177 provides an OE-style replacement option.

What It Helps Address

• Rear suspension clunking or knocking from worn arm bushings
• Excessive play in the rear left upper rearward suspension link
• Uneven rear tire wear related to suspension movement
• Rear-end instability or wandering caused by worn suspension components
• Failed inspection due to damaged lateral arm bushings or arm wear

Installation Notes and Tips

Verify vehicle year, make, model, and rear suspension configuration before ordering. This part uses a bolt-on attachment and bushing ends, so inspect the mounting points and related hardware condition during replacement. Confirm the Buick LaCrosse application includes RPO Code GNE (H-Arm Rear Suspension). Professional alignment is recommended after suspension component replacement.

Quality Assurance

Dorman designs this lateral arm as a standard replacement part and subjects it to testing for fit and function on the listed applications. The part number is 527-177.