{"product_id":"readylift-2-0-sst-lift-kit-at4-trail-boss-2019-69-3920","title":"ReadyLIFT 2.0\" SST Lift Kit | 2019–2023 GMC Sierra AT4 \u0026 Chevy Silverado Trail Boss","description":"\u003cp\u003e\u003cstrong\u003eReadyLIFT 2.0\" SST Lift Kit | 2019–2023 GMC Sierra AT4 \u0026amp; Chevy Silverado Trail Boss\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs This for You?\u003c\/strong\u003e\u003cbr\u003eYou're running a 2019–2023 GMC Sierra AT4 or Chevy Silverado Trail Boss — trucks that already come with a factory 2\" front lift and longer strut assemblies — and every generic leveling kit on the market either binds the factory ball joint or contacts the lower strut and CV axle. You need a lift kit engineered specifically for the AT4 and Trail Boss platform that works with the factory suspension lift, not against it. The ReadyLIFT 69-3920 is the only SST lift kit purpose-built for these trucks, delivering an additional 2\" of front lift and 1\" of rear lift without compromising the factory suspension architecture.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe Result\u003c\/strong\u003e\u003cbr\u003eA CNC-machined billet aluminum top mount strut spacer and pre-load spacer work in concert with the factory 2\" front lift to deliver a combined 4\" of total front elevation — 2\" added by this kit on top of the factory lift. Tubular upper control arms with 1-ton ball joints and maintenance-free TCT pivot bushings restore proper suspension geometry at the new ride height. OE-style 3\" tall cast iron rear lift blocks with new longer U-bolts and rear bump stop extension cups complete the package, creating a subtle rake that looks purpose-built on the AT4 and Trail Boss body lines. The Trail Boss clears a 295\/65R20 on a 20x9 0-offset wheel; the AT4 runs up to a 305\/55R20 on the same wheel spec.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVerified Fitment (OFAS Standard)\u003c\/strong\u003e\u003cbr\u003e✅ Fits: 2019–2023 GMC Sierra 1500 AT4\u003cbr\u003e✅ Fits: 2019–2023 Chevrolet Silverado 1500 Trail Boss\u003cbr\u003e❌ Does NOT fit: GMC Sierra AT4X\u003cbr\u003e❌ Does NOT fit: Chevrolet Silverado ZR2\u003cbr\u003e❌ Does NOT fit: Vehicles equipped with rear composite mono-leaf springs — mono-leaf identifiable by round\/circular U-bolt at top of leaf spring; this kit requires traditional square U-bolt steel leaf springs\u003cbr\u003e❌ Does NOT fit: Late model 2024 and 2025 applications with round U-bolts without upgrade — U-bolt part number 67-35120UB required for 2025 compatibility\u003cbr\u003e❌ Note: Use of Auto 4 HI (4Auto) feature is not recommended with this kit\u003cbr\u003e❌ Note: NOT intended for off-road use or abuse\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\u003eLift Height Added\u003c\/td\u003e\n\u003ctd\u003e2.0\" Front (additional) \/ 1.0\" Rear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Front Lift\u003c\/td\u003e\n\u003ctd\u003e~4.0\" combined with factory 2\" lift\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Components\u003c\/td\u003e\n\u003ctd\u003eCNC billet aluminum top mount strut spacer, CNC billet aluminum pre-load spacer, tubular UCAs with 1-ton ball joints \u0026amp; TCT maintenance-free pivot bushings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Components\u003c\/td\u003e\n\u003ctd\u003e3\" OE-style cast iron lift blocks with axle pad locating ears, new longer U-bolts, rear bump stop extension cups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign\u003c\/td\u003e\n\u003ctd\u003eBolt-on, no cutting or welding required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003e69-3920\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\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eMax Tire\u003c\/th\u003e\n\u003cth\u003eWheel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eChevy Silverado Trail Boss\u003c\/td\u003e\n\u003ctd\u003e295\/65R20\u003c\/td\u003e\n\u003ctd\u003e20x9 0 offset\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGMC Sierra AT4\u003c\/td\u003e\n\u003ctd\u003e305\/55R20\u003c\/td\u003e\n\u003ctd\u003e20x9 0 offset\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eReadyLIFT wheel and tire fitment recommendations are based on Wheel Pros wheels and Nitto tires. Actual dimensions vary meaningfully by manufacturer — overall diameter, tread width, aspect ratio, and sidewall construction will differ. Every tire and wheel combination must be test fit prior to final installation. Upgrading to heavier 10-ply (Load Range E) all-terrain or mud-terrain tires will noticeably increase suspension stiffness and alter ride harshness compared to factory 6-ply (Load Range C) tires. Consult your local installer for application-specific guidance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation \u0026amp; Engineering Notes\u003c\/strong\u003e\u003cbr\u003eThis is a complete bolt-on system requiring no cutting or welding. A professional 4-wheel alignment is mandatory post-installation to verify torque specs, confirm ride height, and lock in corrected UCA geometry. Verify rear leaf spring type before ordering — this kit is NOT compatible with mono-leaf rear springs (identifiable by round\/circular U-bolts). Late model 2024 and 2025 trucks with round U-bolts require U-bolt part number 67-35120UB. Lifting your vehicle raises its center of gravity; exercise appropriate caution on- and off-road. All Advanced Driver Assistance Systems (ADAS) including GM Safety Alert Seat, Lane Keep Assist, and Forward Collision Alert must be checked and recalibrated after installation.\u003c\/p\u003e\u003cblockquote\u003e\n\u003cstrong\u003eEngineering Question:\u003c\/strong\u003e Does your AT4 or Trail Boss have rear composite mono-leaf springs or traditional multi-leaf steel springs? Inspect the U-bolt at the top of your rear leaf spring — round\/circular U-bolts indicate mono-leaf, which is NOT compatible with this kit. Confirm your rear spring configuration before ordering.\u003c\/blockquote\u003e","brand":"ReadyLIFT Suspension","offers":[{"title":"Default Title","offer_id":51631859040577,"sku":"69-3920","price":699.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0974\/1284\/1793\/files\/69-3920.jpg?v=1776280649","url":"https:\/\/obsidianforgedautosupply.com\/products\/readylift-2-0-sst-lift-kit-at4-trail-boss-2019-69-3920","provider":"Obsidian Forged Auto Supply","version":"1.0","type":"link"}