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. 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. Springs feature 600 lb/in front rates and 130 lb/in linear rate. Premium CrSi US sourced wire used on all lowering springs. Shocks feature race proven construction for durability. Nitrogen charged monotube shock for great control. Comfortable yet performance oriented compression valving. Ramped up rebound valving. Complete kit Made in the USA.

Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? PSI sells Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. These harnesses include the Gen II LT1/LT4, Gen III (24x) LS1/LS6 and Vortec Truck Engines as well as Gen IV (58x) LS2, LS3, LS7, & Vortec and GEN V LT / ECOTEC3 Engines. All PSI Harnesses are Made in the USA. In addition to wiring harnesses, PSI carries Holley Products, Vintage Air A/C, Dakota Digital Gauges, HPTuners and PCM programming, Fuel Pump Kits, Engine Sensors, Extension Harnesses, Replacement GM connector pigtails and a complete line of hardware to complete your conversion needs!

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1978-1988 GM G-Body UMI Shock and Spring Kit

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