Trailing Arm Mounts Metric GM Upper 1pr

The Allstar Performance Trailing Arm Mounts Metric GM Upper pair (ALL60059) is a purpose-built suspension component engineered for General Motors metric frame applications. These upper trailing arm brackets provide the structural foundation for proper rear suspension geometry in both street and competition vehicles, delivering the precise mounting interface required for consistent handling characteristics and load distribution.

Constructed from steel with a natural finish, these brackets weigh 2.85 lbs for the pair and maintain compact dimensions (5.4 x 3.4 x 6.8 inches) for efficient packaging in tight chassis environments. The metric GM fitment ensures direct compatibility with factory frame rails and suspension pickup points on eligible vehicles. As a suspension component, proper installation—following manufacturer torque specifications and alignment procedures—is critical to achieve the geometry and safety margins these brackets were designed to provide.

These trailing arm mounts serve builders and technicians working on GM metric platform suspensions, whether for street performance, circle track racing, or suspension restoration. The upper position in the trailing arm assembly carries significant lateral and longitudinal loads during acceleration, braking, and cornering. Using OEM-specification or equivalent-quality brackets ensures the rear axle assembly maintains the intended moment center and roll axis geometry, directly affecting tire contact patch consistency and predictable weight transfer characteristics.

The pair format allows replacement of both upper mounts simultaneously, ensuring symmetrical suspension tuning and eliminating unmatched bracket conditions that could cause handling imbalance. This is the OEM-equivalent approach preferred by suspension specialists for comprehensive rear-end rebuilds or upgrades on GM metric-frame vehicles.