ReadyLIFT 4" (4-inch + Factory 2-inch) Big Lift Kit With Falcon 2.1 Shocks - 2019-2024 1500 Trail Boss / AT4
For qualified buyers at checkout
Secure checkoutEncrypted payment
Warranty Information
Vendor warranty summary
ReadyLIFT Warranty
At a glance: Defective parts replaced with no stated time limit; wear parts up to 1 year
This is ReadyLIFT's warranty, not an NVMOS policy. We've summarized it in plain English to save you a search. The manufacturer's official terms always govern and can change without notice. Last reviewed on nvmos.com: October 4, 2026.
Coverage by product
| Product or component | Coverage |
|---|---|
| Lift and leveling kit components | Lifetime replacement for defects (original buyer) |
| Wear parts: shocks, ball joints, heim joints, bushings, steering extensions | Up to 1 year |
| Discontinued, clearance or outlet products | Not covered |
- Original purchaser only — coverage does not transfer if you sell it.
What's covered
- Missing or defective components: if a part breaks, ReadyLIFT sends a new one
- ReadyLIFT may ask for the old part back at its own cost for analysis, without holding up the replacement
- Jeep SST and Terrain Flex kits are covered for recreational off-road use
What's not covered
- Off-road abuse (except Jeep SST and Terrain Flex kits)
- Discontinued, clearance and outlet items
- Labor, installation, surcharges and fees
- Resulting damage to the vehicle
How to make a ReadyLIFT warranty claim
- Call ReadyLIFT customer service to start a claim (7:30am-4pm MST)
- ReadyLIFT ships the replacement part, quickly where possible
ReadyLIFT contact: Phone: 800-549-4620 (toll free); 702-410-2300 · Claim page / support
Bought it from NVMOS? Start with us.
Have your order number and a few photos of the issue ready, then call real humans at (920) 249-7744 or send us a message. We'll tell you whether the claim goes through us or straight to ReadyLIFT, and help it along either way.
Shop ReadyLIFT at NVMOS
ReadyLIFT 8" Lift Kit - Toyota Tundra 2007-2021 W/ Bilstein Shocks
ReadyLIFT 1.5" Rear Add-A-Leaf Kit - Ford F-150
ReadyLIFT 7/8" Wheel Spacers W/ Studs - GM 1500
See all ReadyLIFT products, lead times and FAQs →
Disclaimer: The information on this page describes ReadyLIFT's own warranty policy. It is not a warranty offered by NVMOS (No Visible Means of Support LLC). Manufacturers update their terms at any time; we review these pages periodically, but the manufacturer's current official policy is the one that applies to your claim. Source: ReadyLIFT official warranty information. Last updated on nvmos.com: October 4, 2026. See our return policy for NVMOS's own terms.
About the brand
ReadyLIFT is an Ogden, Utah suspension brand built around more tire clearance with close-to-factory ride. NVMOS carries ReadyLIFT leveling kits, SST mid-lifts, Big Lift kits, rear blocks, control arms and wheel spacers for Ford, GM, Ram, Toyota and Jeep trucks.
Based in: Ogden, Utah · Founded: 2006 · Lead time: In-stock ships in 24–48 hrs
Shop all 556 ReadyLIFTWarrantyAll brands
Warranty terms are set by ReadyLIFT, not NVMOS, and can change. Bought from us? Call (920) 249-7744 and we'll handle the claim with the brand.
ReadyLIFT 4" Big Lift Kit With Falcon 2.1 Shocks for 2019-2024 Silverado Trail Boss and Sierra AT4 1500
The ReadyLIFT 44-39421 is a 4" big lift kit for 2019-2024 Chevy Silverado Trail Boss and GMC Sierra AT4 1500 trucks. It stacks on top of the 2" factory lift, with Falcon 2.1 rear shocks and revised geometry to help prevent driveline vibration. See other full-size truck parts.
Boxed steel front and rear cross members and a full-width front skid plate use thick 3/16" plate steel. The differential drop brackets are 1/4" boxed plate with a double gusset, and the knuckles are heavy-duty cast iron. Angled, offset top mount strut extensions realign the struts. Compare our shock absorbers as well. Auto 4 Hi is not recommended.
| Spec | Detail |
|---|---|
| Lift | 4" plus the factory 2" |
| Recommended max tire, no trimming | 35x12.50 on 20x9, 0 offset |
| Shocks | Falcon 2.1 rear shocks |
| Warranty | ReadyGuard Powertrain Warranty |
| SKU | 44-39421 |
- Heavy-duty front and rear cross members and skid plate
- Top mount strut extensions and rear shock extensions
- Sway bar drop brackets
- Fabricated steel rear lift blocks with bump stop landings
- Cast iron lift knuckles
- Falcon 2.1 shocks
- Hardware and instructions
2019-2024 Chevy Silverado Trail Boss and GMC Sierra AT4 1500 4WD. Not compatible with rear mono-leaf springs or diesel engines. Single cab fitment has not been validated. Will not fit late model 2024 or 2025 trucks with round U-bolts unless you use U-bolt 67-35150UB. An 18" wheel is not recommended.
Install guides & documents
Complete your build
The pieces owners run with this one — matched to your build and to each other. Do the whole truck in one order instead of three.
$2,399.95
$449.00
$4,999.95
$79.95
$249.99
ReadyLIFT 4" (4-inch + Factory 2-inch) Big Lift Kit With Falcon 2.1 Shocks FAQs
Does it fit diesel trucks?
No. It is not for diesel applications because it has no oil line relocation bracket.
Does it work with mono-leaf rear springs?
No. It is not compatible with rear mono-leaf springs.
Can I run 18" wheels?
ReadyLIFT does not recommend an 18" wheel. An 18x9 with 0 mm offset or higher does not work.
Will it fit a 2025 truck?
Not this kit. The 2025-2026 trucks have their own version, 44-35426.
Multi-column
Join Our Community
For all things NVMOS, check us out on Instagram and Facebook!
Financing Available
Pay over time with Affirm or PayPal Credit at checkout, for qualified buyers.
Contact Us
Have a question? Just send us an e-mail at support@nvmos.com
