{"product_id":"umi4052r-64-66-gm-a-body-1in-rear-lowering-spring-set","title":"UMI Performance 64-66 GM A-Body 1in Lowering Spring Set Rear","description":"\u003ch4\u003eGet the Rear Stance Right Without Touching the Front End\u003c\/h4\u003e\n\u003cp\u003eThe UMI4052R 1 inch rear lowering spring set drops the back of your 1964 to 1966 GM A-Body to match a lowered front end or to clean up a stock ride height that always looked a little too tall in back. Wound from premium chrome silicon wire at a linear 130 lb\/in rate, this rear-only kit tightens up body roll and removes the floating feeling that stock A-Body springs are known for.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eRear-only kit for a clean 1 inch drop without disturbing front geometry\u003c\/li\u003e\n\u003cli\u003eLinear 130 lb\/in spring rate wound from premium chrome silicon wire\u003c\/li\u003e\n\u003cli\u003eReduces body roll and eliminates the common floating feeling in A-Body rear suspension\u003c\/li\u003e\n\u003cli\u003eSuitable for Pro-Tour, Auto-x, and general street cruising applications\u003c\/li\u003e\n\u003cli\u003eDurable black powder coat finish\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on installation, no cutting or modification required\u003c\/li\u003e\n\u003cli\u003eDesigned and manufactured in the USA from North American raw materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFitment Table\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1965-1966\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eGran Sport\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eSkylark\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eSpecial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eSportwagon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eChevelle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eEl Camino\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eMalibu\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eOldsmobile\u003c\/td\u003e\n\u003ctd\u003e442\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eOldsmobile\u003c\/td\u003e\n\u003ctd\u003eCutlass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eOldsmobile\u003c\/td\u003e\n\u003ctd\u003eF85\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003eOldsmobile\u003c\/td\u003e\n\u003ctd\u003eVista Cruiser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003ePontiac\u003c\/td\u003e\n\u003ctd\u003eGTO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003ePontiac\u003c\/td\u003e\n\u003ctd\u003eTempest\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1964-1966\u003c\/td\u003e\n\u003ctd\u003ePontiac\u003c\/td\u003e\n\u003ctd\u003eLemans\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eUMI4052R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eNot assigned by manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eUMI Performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition\u003c\/td\u003e\n\u003ctd\u003eRear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring Rate\u003c\/td\u003e\n\u003ctd\u003e130 lb\/in linear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eChrome silicon wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBlack powder coat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrop Amount\u003c\/td\u003e\n\u003ctd\u003e1 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eUMI4052R rear lowering spring set, quantity 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eAbout UMI Performance\u003c\/h4\u003e\n\u003cp\u003eUMI Performance designs and manufactures chassis, suspension and driveline components for GM muscle cars entirely in the United States. Every part is engineered by racers who use their own track and street experience to solve real fitment and handling problems, then built from North American raw materials with consistent spring rates and durable finishes for a repeatable fit.\u003c\/p\u003e\n\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/umi-performance-68-72-gm-a-body-tubular-upper-lower-control-arms\"\u003eUMI Performance 68-72 GM A-Body Tubular Upper \u0026amp; Lower Control Arms\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/umi-performance-82-92-gm-f-body-boxed-style-weld-in-subframe-connectors\"\u003eUMI Performance 82-92 GM F-Body Boxed Style Weld-In Subframe Connectors\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the UMI4052R?\u003c\/strong\u003e\n\u003cp\u003eThe UMI4052R is a rear-only 1 inch lowering spring set for 1964 to 1966 GM A-Body vehicles, wound from chrome silicon wire at a linear 130 lb\/in rate and finished in black powder coat. It drops rear ride height by 1 inch without any front end modification.\u003c\/p\u003e\n\n\u003cstrong\u003eDoes the UMI4052R include front springs?\u003c\/strong\u003e\n\u003cp\u003eNo. The UMI4052R is a rear-only spring set. UMI also offers the 4052 kit, which includes matching front and rear springs for a full 1 inch drop.\u003c\/p\u003e\n\n\u003cstrong\u003eWill this spring set eliminate body roll?\u003c\/strong\u003e\n\u003cp\u003eThe linear 130 lb\/in rate significantly reduces body roll compared to stock rear springs and removes the floating feeling common in unmodified A-Body rear suspension.\u003c\/p\u003e\n\n\u003cstrong\u003eIs any cutting or drilling required to install the UMI4052R?\u003c\/strong\u003e\n\u003cp\u003eNo. This is a direct bolt-on spring set that installs into the factory rear spring pockets with no cutting, drilling or welding required.\u003c\/p\u003e\n\n\u003cstrong\u003eHow much does the UMI4052R lower the rear of the car?\u003c\/strong\u003e\n\u003cp\u003eThe UMI4052R lowers rear ride height by approximately 1 inch from stock, depending on vehicle weight and equipment.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat vehicles fit the UMI4052R?\u003c\/strong\u003e\n\u003cp\u003eThis spring set fits the 1964 to 1966 Buick Gran Sport, Skylark, Special and Sportwagon, Chevrolet Chevelle, El Camino and Malibu, Oldsmobile 442, Cutlass, F85 and Vista Cruiser, and Pontiac GTO, Tempest and Lemans, based on the exact year ranges shown in the fitment table above.\u003c\/p\u003e\n\n\u003cstrong\u003eIs the UMI4052R a good match for Pro-Tour or Auto-x builds?\u003c\/strong\u003e\n\u003cp\u003eYes. The linear spring rate and reduced body roll make this spring set well suited to Pro-Tour, Auto-x and general street cruising applications.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat material are the UMI4052R springs made from?\u003c\/strong\u003e\n\u003cp\u003eThe springs are wound from premium chrome silicon wire, which provides consistent spring rates and long service life compared to standard steel replacement springs.\u003c\/p\u003e\n\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eSupport the rear axle with a suitable jack and safely relieve spring pressure before removing the factory rear springs.\u003c\/li\u003e\n\u003cli\u003eRemove the factory rear coil springs from the spring pockets.\u003c\/li\u003e\n\u003cli\u003eInstall the UMI4052R rear springs into the factory spring pockets, verifying correct seating top and bottom.\u003c\/li\u003e\n\u003cli\u003eReconnect the rear axle and any disturbed suspension components.\u003c\/li\u003e\n\u003cli\u003eLower the vehicle and torque all hardware to manufacturer specification.\u003c\/li\u003e\n\u003cli\u003eCheck rear ride height and verify adequate clearance before driving.\u003c\/li\u003e\n\u003c\/ol\u003e\n","brand":"UMI Performance","offers":[{"title":"Default Title","offer_id":46195443269711,"sku":"UMI4052R","price":189.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/umi-lowering-spring-1_e2654dfc-72c9-4ce5-90ad-9ee8c68e8f55.webp?v=1785080356","url":"https:\/\/www.blackopsautoworks.com\/products\/umi4052r-64-66-gm-a-body-1in-rear-lowering-spring-set","provider":"Black Ops Auto Works","version":"1.0","type":"link"}