QA1 GD401-10600A Pro-Coil System Double Adjustable GM Front Coilover Kit with 600 lb/in Springs

The QA1 GD401-10600A GM Pro-Coil System delivers professional-grade suspension performance with complete adjustability for ride height and damping control. This comprehensive coilover conversion kit replaces factory front shocks and springs with a fully adjustable aluminum coilover setup engineered for GM A-body and similar applications.

Complete Coilover System Includes:

• Two GD401 double-adjustable coilover shocks with lightweight billet aluminum bodies
• Two 10-inch high-travel tapered springs with pigtail upper end (600 lb/in rate)
• Complete mounting hardware for bolt-in installation
• Chrome-plated springs with silver powdercoat finish

Key Performance Features:

• Independent compression and rebound adjustment with 18 positions each (324 total valving combinations)
• Fully threaded shock bodies provide up to 3 inches of ride height adjustment
• Twin-tube internal design with 2.0-inch body diameter
• Compressed length: 8.63 inches / Extended length: 12.88 inches
• High-travel springs feature fewer coils and smaller wire diameter for increased usable stroke and reduced unsprung weight
• Upper stud mount and lower T-bar mounting configuration
• 100% dyno tested and serialized for quality assurance
• Serviceable and rebuildable by QA1 authorized service centers

The 600 lb/in spring rate is specifically designed for big block engine applications and heavier front-end weights. This system is ideal for drag racing, street performance, autocross, road racing, and custom street rod applications where precise suspension tuning is critical for optimal performance.

Note: Some front applications may require the lower control arm to be dropped for installation. Control arm shock openings may need enlargement to accept the 2.0-inch shock body diameter. Made in the USA.