Adj. Upper Trailing Arms - 78-88 GM G-Body

The QA1 adjustable upper trailing arm for 1978–1988 GM G-Body vehicles is engineered for owners and fabricators seeking precise rear suspension geometry control on classic muscle cars, street rods, and resto-mods. Whether you're chasing perfect pinion angle on a Chevy Monte Carlo, Buick Regal, or Oldsmobile Cutlass, these arms solve the geometry problems that plague stock rear suspensions, allowing you to dial in alignment for both street handling and drag-strip performance.

Upper trailing arms are critical for controlling wheel hop, axle wrap, and ensuring your rear end stays planted under acceleration and braking. QA1's adjustable design allows independent length modification, letting you fine-tune pinion angle without shimming or custom fabrication—a massive advantage over fixed factory arms. The arms are constructed from high-strength steel and feature urethane or heim-joint bushings depending on configuration, supporting both mild street builds and high-output racing applications.

Adjustability typically spans several degrees of pinion change, enabling you to compensate for suspension travel, engine bay modifications, or transmission swaps that alter geometry. The compact dimensions (5.4 x 4.1 x 20.2 inches) and 8.72-pound weight keep unsprung mass minimal while maintaining structural rigidity under load. These adjustable upper trailing arms are ideal for builders tackling G-Body suspension upgrades, competitive bracket racers, and street enthusiasts upgrading to coilovers.