{"product_id":"readylift-2-0-cast-iron-rear-block-kit-gm-hd-2500-3500-2011-66-3020","title":"ReadyLIFT 2.0\" Cast Iron Rear Block Kit | 2011–2024 GM 2500\/3500 HD Trailer Package \u0026 Dually","description":"\u003cp\u003e\u003cstrong\u003eReadyLIFT 2.0\" Cast Iron Rear Block Kit | 2011–2024 GM 2500\/3500 HD Trailer Package \u0026amp; Dually\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs This for You?\u003c\/strong\u003e\u003cbr\u003eYou're running a 2011–2024 GM 2500 HD Single Rear Wheel with the factory Trailer Package rear springs, or a 3500 HD Dual Rear Wheel truck, and you need 2\" of rear lift to restore rake for towing and hauling — or to level out a front leveling kit. You need OEM-quality cast iron construction, not lightweight extrusions, and U-bolts sized specifically for the trailer package and dually rear suspension geometry. The ReadyLIFT 66-3020 is built to the same standard as the factory blocks, backed by a Lifetime Warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe Result\u003c\/strong\u003e\u003cbr\u003eTwo OEM-style cast iron rear lift blocks at 2.0\" height — manufactured from cast iron just like the factory blocks for maximum strength and reliability, never from lightweight extrusions. Four new longer e-coated U-bolts with nuts and washers are sized specifically for the trailer package and dually rear suspension. The result is 2\" of rear lift that restores a purposeful towing rake, pairs perfectly with any ReadyLIFT leveling kit, and carries a Lifetime Warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVerified Fitment (OFAS Standard)\u003c\/strong\u003e\u003cbr\u003e✅ Fits: 2011–2024 GM Silverado\/Sierra 2500 HD Single Rear Wheel (SRW) with factory Trailer Package rear springs (2WD and 4WD)\u003cbr\u003e✅ Fits: 2011–2024 GM Silverado\/Sierra 3500 HD Dual Rear Wheel (DRW\/Dually)\u003cbr\u003e❌ Does NOT fit: 2500 HD trucks equipped with top-mounted overload springs — confirm spring configuration before ordering\u003cbr\u003e❌ Does NOT fit: 2500 HD trucks without the factory Trailer Package rear springs\u003cbr\u003e❌ Does NOT fit: 2010 and earlier GM HD platforms\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlock Height\u003c\/td\u003e\n\u003ctd\u003e2.0\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlock Construction\u003c\/td\u003e\n\u003ctd\u003eOEM-style cast iron — same material as factory blocks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eU-Bolts\u003c\/td\u003e\n\u003ctd\u003e4x e-coated, trailer package\/dually-specific, with nuts and washers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Applications\u003c\/td\u003e\n\u003ctd\u003e2500 HD SRW w\/ Trailer Package springs; 3500 HD DRW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eReadyLIFT Lifetime Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003e66-3020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eReadyLIFT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eWheel \u0026amp; Tire Fitment\u003c\/strong\u003e\u003cbr\u003eNo wheel or tire restrictions specific to this component. Verify your total lift height and tire clearance with your existing front lift configuration before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation \u0026amp; Engineering Notes\u003c\/strong\u003e\u003cbr\u003eThis is a bolt-on rear block kit requiring no cutting or welding. U-bolts must be torqued to OEM specification at ride height. Do not use this kit on 2500 HD trucks equipped with top-mounted overload springs — the block geometry is not compatible with that spring configuration. A professional alignment check is recommended after installation to confirm ride height. Lifting your vehicle raises its center of gravity; exercise appropriate caution when towing or hauling. All Advanced Driver Assistance Systems (ADAS) including GM Safety Alert Seat and automatic headlight leveling should be verified after any suspension height change.\u003c\/p\u003e\u003cblockquote\u003e\n\u003cstrong\u003eEngineering Question:\u003c\/strong\u003e Is your GM HD a 2500 SRW with the factory Trailer Package rear springs, or a 3500 DRW? And does your 2500 HD have top-mounted overload springs? Confirm your rear spring configuration and axle setup before ordering — this kit is not compatible with top-mounted overload spring applications.\u003c\/blockquote\u003e","brand":"ReadyLIFT Suspension","offers":[{"title":"Default Title","offer_id":51631846326593,"sku":"66-3122","price":169.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0974\/1284\/1793\/files\/66-3122.jpg?v=1776291519","url":"https:\/\/obsidianforgedautosupply.com\/products\/readylift-2-0-cast-iron-rear-block-kit-gm-hd-2500-3500-2011-66-3020","provider":"Obsidian Forged Auto Supply","version":"1.0","type":"link"}