{"product_id":"2019-2024-gm-1500-trail-boss-at4-6-big-lift-kit-w-falcon-2-1-shocks-44-39621","title":"2019-2024 GM 1500 Trail Boss \/ AT4 6\" Big Lift Kit w\/ Falcon 2.1 Shocks (44-39621)","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003cp\u003eReadyLIFT's reengineered 6\" Big Lift Kit for the 2019-2024 Chevy Silverado 1500 Trail Boss and GMC Sierra 1500 AT4 adds 6\" on top of the factory 2\" lift. Heavy-duty angled and offset top mount strut extensions realign the struts, and a lower mount pre-load spacer slightly raises spring rate for larger wheels and tires. The engineering updates developed for the 2025 trucks carry over, with redesigned steering knuckles, retained factory Auto 4WD and revised geometry to help prevent driveline vibration. Fabricated rear blocks and an add-a-leaf lift the rear, paired with new Falcon 2.1 Monotube rear shocks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 44-39621 (supersedes 44-39620)\u003c\/p\u003e\n\u003ch6\u003eFeatures\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eProprietary lower strut clamshell design maintains factory geometry and retains the factory strut\u003c\/li\u003e\n\u003cli\u003eTube steel upper control arms with maintenance-free pivot bushings and 1-ton ball joints\u003c\/li\u003e\n\u003cli\u003e3\/16\" thick steel plate cross members and full-width skid plate\u003c\/li\u003e\n\u003cli\u003eAnti-torsion boxed and gusseted plate steel differential drop brackets\u003c\/li\u003e\n\u003cli\u003eFabricated steel 5\" rear lift blocks with integrated bump stop landings and offset pin for proper pinion angle\u003c\/li\u003e\n\u003cli\u003eRear add-a-leaf for an additional 1.5\" of lift\u003c\/li\u003e\n\u003cli\u003eFalcon 2.1 Monotube extended-length rear shocks (2.3\" aluminum body, 3\/4\" shaft)\u003c\/li\u003e\n\u003cli\u003eRedesigned steering knuckles for an improved turning radius\u003c\/li\u003e\n\u003cli\u003eRetains factory Auto 4WD functionality\u003c\/li\u003e\n\u003cli\u003eRevised suspension geometry helps prevent driveline vibration\u003c\/li\u003e\n\u003cli\u003eIncludes ReadyGuard Powertrain Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTire Fitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRecommended max tire with no trimming: 20x9 0 offset - 37x12.50 tire\u003c\/li\u003e\n\u003cli\u003e*Max with trimming: 20x10 -18 offset - 37x12.50\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eNotes\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eUse of Auto 4 Hi feature not recommended\u003c\/li\u003e\n\u003cli\u003eNot compatible with rear mono-leaf springs\u003c\/li\u003e\n\u003cli\u003eSingle Cab configuration has not been validated for fitment \u0026amp; drivability by ReadyLIFT\u003c\/li\u003e\n\u003cli\u003eNot for use on diesel applications (no oil line relocation bracket included)\u003c\/li\u003e\n\u003cli\u003eLate 2024 trucks with round rear U-bolts require U-bolt kit 67-35150UB\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"ReadyLift","offers":[{"title":"Default Title","offer_id":47361711964249,"sku":"44-39621","price":3769.94,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8030\/9593\/files\/44-39621.jpg?v=1790892038","url":"https:\/\/dirtygarage.com\/products\/2019-2024-gm-1500-trail-boss-at4-6-big-lift-kit-w-falcon-2-1-shocks-44-39621","provider":"Dirty Garage","version":"1.0","type":"link"}