UMI Performance 1978-1988 GM G-Body UMI Shock and Spring Kit, 1S Lowering

Part Number: UMISS103050G

UMI Performance 1978-1988 GM G-Body UMI Shock and Spring Kit, 1S Lowering

Part Number: UMISS103050G

$729.94

In Stock

( Inventory updated: 06/06/2026 )

Estimated ship date: 2-3 business days

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1978-1988 GM G-Body UMI Shock and Spring Kit, 1S Lowering

  • 1978-1988 GM G-Body UMI Shock and Spring Kit, 1? Lowering
  • Comfortable yet performance oriented compression valving.
  • Complete kit Made in the USA.
  • Nitrogen charged monotube shock for great control.
  • Premium CrSi US sourced wire used on all lowering springs.
  • Ramped up rebound valving.
  • Shocks feature race proven construction for durability.
  • Springs feature 600 lb/in front rates and 130 lb/in linear rate.
  • Springs: Springs intended for small block engine. Lightweight LS may require trimming and an additional 1/4 front end drop may occur with a full weight big block.
  • The UMI Performance spring and shock kit is designed to lower your car 1 while providing a huge improvement in handling and control. These kits feature our race quality lowering springs which provide a high performance foundation for your ride. Premium US sourced CrSi wire is wound into the correct rates for street cruising, Pro-Touring, corner carving or light drag use. The UMI Performance monotube shock features medium-firm compression valving and a ramped up rebound curve to properly control the UMI spring. The rebound valving also controls body roll when cornering and contributes to a high performance ride.

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UMI Performance

UMI Performance was founded in 2002 as a father/son business developing performance parts for GM and Ford products. They quickly began to focus on suspension upgrades for both older and late model muscle cars, and have become a leader in replacement and high-performance suspension components, from individual parts to entire kits.

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