66-3121 1" REAR BLOCK KIT - GM SILVERADO / SIERRA 2500/3500 HD OEM STYLE W/ FACTORY TOP OVERLOADS 2011-2022

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66-3121 1" REAR BLOCK KIT - GM SILVERADO / SIERRA 2500/3500 HD OEM STYLE W/ FACTORY TOP OVERLOADS 2011-2022

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2011-2022 GM 2500HD/3500HD OEM Style 1" Rear Lift Block Kit

For Use Only on SRW 2500HD trucks that have the factory Trailer Package rear springs.