{"product_id":"2019-2024-gm-1500-trail-boss-at4-4-big-lift-kit-w-falcon-2-1-shocks-44-39421","title":"2019-2024 GM 1500 Trail Boss \/ AT4 4\" Big Lift Kit w\/ Falcon 2.1 Shocks (44-39421)","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003cp\u003eReadyLIFT's reengineered 4\" Big Lift Kit for the 2019-2024 Chevy Silverado 1500 Trail Boss and GMC Sierra 1500 AT4 adds 4\" on top of the factory 2\" lift. The engineering updates developed for the 2025 trucks carry over: redesigned steering knuckles for a better turning radius, retained factory Auto 4WD and revised geometry to help prevent driveline vibration, and it now ships with Falcon 2.1 Monotube rear shocks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 44-39421 (supersedes 44-39420)\u003c\/p\u003e\n\u003ch6\u003eFeatures\u003c\/h6\u003e\n\u003cul\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\u003e*Max with trimming: 20x10 -18 offset - 35x12.50 or 325\/60R20\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\u003e18\" wheels are not recommended; an 18x9 with 0mm offset or higher does not fit\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":47361709736025,"sku":"44-39421","price":3119.94,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8030\/9593\/files\/44-39421.jpg?v=1790892016","url":"https:\/\/dirtygarage.com\/products\/2019-2024-gm-1500-trail-boss-at4-4-big-lift-kit-w-falcon-2-1-shocks-44-39421","provider":"Dirty Garage","version":"1.0","type":"link"}