Adj. Upper Trailing Arms - 64-67 GM A-Body

The QA1 Adjustable Upper Trailing Arms for 64-67 GM A-Body vehicles deliver precision suspension geometry tuning for street and competition applications. These tubular aluminum trailing arms feature greasable polyurethane bushings and red anodized finish, engineered to optimize rear axle control during acceleration, braking, and cornering. Supplied as a complete pair, they represent a purpose-built upgrade for A-Body platform builders focused on chassis dynamics and handling consistency.

Adjustability is the defining feature of this QA1 design. Rear upper trailing arm geometry directly influences axle housing angle, anti-squat characteristics, and load transfer during acceleration. The adjustable design allows builders to dial in pinion angle, compensate for suspension travel, and maintain consistent rear tire contact patch—critical for both street manners and track stability. At 9.1 lbs per pair and constructed from aluminum with polyurethane bushings rated for street and moderate performance duty, these arms balance weight savings with operational durability. The 20.2-inch length positions them for stock and modified A-Body applications without clearance conflicts at common suspension heights.

A-Body platform builds—whether 1964-1967 Chevelle, Malibu, or El Camino—demand upper trailing arm geometry tuning when suspension is lowered, engine torque is increased, or axle housing is repositioned. This QA1 pair addresses that requirement with adjustable geometry and greasable bushings that allow field maintenance without arm removal. Builders working on restorations, street-strip conversions, or road-course preparation will find the adjustability essential for dial-in work after initial setup and test drives.