Upgrade your classic truck’s suspension and handling with the UMI Performance C10 4-Link Suspension Kit—the premier solution for 1973-1987 Chevy and GMC squarebody owners looking to unleash the full potential of their ride.

The UMI 6425 kit replaces the outdated leaf spring setup on your C10 with a race-inspired 4-link rear suspension system featuring unequal length trailing arms, an adjustable panhard bar, and high-performance Viking coilovers (add-on). Engineered for serious street and pro-touring enthusiasts, this suspension kit is tuned for maximum traction, precision alignment, and stellar ride comfort. Whether it's weekend cruising, autocross, or high-power builds, the UMI 4-link delivers proven results.

Key Features & Benefits

• Race Inspired, Unequal Length Trailing Arms:
  Provides superior axle control, reduced wheel hop, and enhanced traction compared to factory leaf springs, optimizing your C10’s suspension geometry for both street and performance driving.

• Fully Adjustable Panhard Bar:
  Lets you easily center your rear axle after lowering or height changes by fine-tuning bar length. Adjust mounting height at the frame or axle to dial in your rear roll center—precisely tune handling and body roll to your preferences.

• Instant Center Adjustable Chassis Mounts:
  Quickly change suspension pickup points to tune anti-squat, instant center location, and weight transfer under acceleration, giving you the edge for drag strip launches and corner exit grip.

• Heavy Duty Crossmember Included:
  Designed for strength and rigidity, maintaining chassis integrity under aggressive loads, and tying the entire rear suspension assembly together. Add optional PN 6426 rear frame brace for additional frame strengthening.

• Available Fuel Tank Relocation:
  Integrated crossmember mounting points for optional PN 6428 fuel tank relocation kit.

• Light Fabrication Required:
  Straightforward installation with basic fabrication such as drilling out old spring perch rivets and trimming for the included notch kit—no guesswork or excessive modifications required. Simply bolt-on after completing the frame modifications.

• Aftermarket Rear Ready:
  The included lower rear-end panhard bar mounting bracket is specifically designed to clear most aftermarket rears with additional center section bracing.

• Race Proven, Built in the USA:
  Trusted on race tracks and by performance builders across the USA, every UMI 4-link kit is engineered, manufactured, and tested right here in America from the best materials.

• Unequal length trailing arms for maximum performance
• Adjustable panhard bar for axle centering and roll center tuning
• Double adjustable, race-proven Viking coilovers
• Heavy-duty crossmember for strength and regidity
• Works with factory or UMI relocated fuel tanks
• Minimal fabrication for installation
• 6 inch drop nominal ride height range
• Made in the USA, track tested for confidence

 Installation Instructions