QA1 MD301-08500 Mustang II Pro Coil Double-Adjustable Coilover Conversion System 500 lb

The QA1 MD301-08500 is a Mustang II Pro Coil double-adjustable coilover conversion system designed for street rods and custom builds using the popular Mustang II front suspension. This kit replaces the factory shock and spring combination with a fully integrated coilover unit, delivering dramatically improved handling, stance, and ride quality tuning capability.

Featuring a fully threaded aluminum shock body, this system allows precise ride height adjustment to achieve the ideal stance or fine-tune front-to-rear weight balance for superior cornering and handling response. The double-adjustable valving gives independent control over both compression and rebound damping for maximum tunability across a wide range of driving conditions and application types.

With a 500 lb/in spring rate, this kit is matched to front end weights of 1,350–1,525 lbs, making it an ideal choice for most street rod and custom chassis builds using the Mustang II front clip. Chrome-plated springs are specially engineered to fit correctly in the spring pocket and feature a longer design for increased suspension travel.

Key Features:

• Double-adjustable valving with independent compression and rebound control
• Fully threaded aluminum shock body for on-the-fly ride height adjustment
• 500 lb/in chrome-plated coilover springs — recommended for 1,350–1,525 lb front end weight
• Lightweight aluminum shock construction
• 100% dyno tested and serialized at the factory
• Bolt-in installation — all mounting hardware included
• Rebuildable and revalveable by QA1 or authorized service centers
• Sold as a complete pair
• Made in the U.S.A.

Suited for drag racing, autocross, road racing, street performance, and street rod applications, the MD301-08500 delivers professional-grade suspension performance for Mustang II-based builds. Additional spring rate options (375, 600, and 700 lb/in) and valving configurations are available within the QA1 Pro Coil lineup.