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The UMI 6425 kit replaces the outdated leaf spring setup on your C10 with a race-inspired 4-link rear suspension system featuring unequal length trailing arms, an adjustable panhard bar, and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

73-87 C10 Coilover Rear

UMI Rear Coilover System - 73-87 C10