The ReadyLIFT 6" Big Lift Kit gives the truck a tall stance and room for a large tire package. Every major component is designed for this truck's chassis and suspension layout. ReadyLIFT kit 44-21630 is engineered for the 2021-2026 Ford F-150.
What's Included:
| Kit components (ReadyLIFT) |
|---|
| 2 front strut spacers, 1 Driver Knuckle, 1 Passenger Knuckle, 1 Front Crossmember, 1 Rear Crossmember, 1 Driver Diff Drop, 1 Driver Diff Support Bracket |
| 1 Passenger Diff Drop, 1 Passenger Diff Support Bracket, 1 Skid Plate, 1 Driver Brake line Bracket, 1 Passenger Brake Line Bracket, 1 Driver Sway Bar Drop |
| 1 Passenger Sway Bar Drop, 1 Front Drive Line Spacer, 1 Driver Rear Block, 1 Passenger Rear Block, 4 U-Bolts, 1 Rear Brake Line Bracket, 2 Rear Shocks Extensions |
| 1 Carrier Bearing Drop, 1 Alignment Cam Kit, 1 Hardware Pack |
Wheels, tires, alignment, headlamp aiming, ADAS recalibration and any trimming labor are not included.
Features
Tall stance, big tires
A big lift raises the truck well beyond leveling height and clears a large tire package. ReadyLIFT lists the tested tire size for each kit.
Geometry relocated, not stretched
Instead of only spacing parts apart, the kit moves suspension mounting points down with heavy-duty brackets, crossmembers, knuckles or springs to keep angles workable.
Heavy-duty steel construction
Brackets and crossmembers are fabricated from heavy steel plate sized for the loads of a lifted truck on large tires.
Driveline and steering addressed
Big lifts change driveline and steering angles, so ReadyLIFT includes the drops, spacers or brackets this platform needs at the new height.
Complete system per truck
Each kit is engineered around one truck platform and ships with the components listed in its kit contents.
Fitment & Compatibility
Fit guidance: Fits: 2021-2026 Ford F-150, with the qualifiers shown. Check your vehicle's trim, drivetrain and factory suspension against these notes before ordering.
Qualifier: Not for Raptor, Tremor trims; 4WD only; With CCD damping
ReadyLIFT fit notes for this part
| Does not fit 2WD, Tremor, and Raptor |
| Not compatible with Ford BlueCruise |
| Does not fit F150 equipped with the Diesel engine |
Specifications
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Brand: ReadyLIFT
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Warranty: ReadyLIFT No Hassle warranty, original purchaser; wear parts incl. shocks up to 1 year
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Lift height: 6"
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Install time (ReadyLIFT estimate): about 10 hours (give or take 1), alignment and wheel mounting extra
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Shipping weight: 275 lb
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Kit type: Lift kit
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Largest tire: 37" (with trimming)
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Shocks included: No
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Alignment required: Yes, after installation
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Install difficulty: Professional install recommended
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Part number: 44-21630
Tire fitment (ReadyLIFT's published guidance for this kit)
| 295/65R20 for no rub on a 9" wide wheel with 0 offset |
| 37" Maximum tire diameter with possible trimming. |
Tire and wheel sizes vary by manufacturer, so test-fit your combination before installation.
Installation
Type: full suspension lift · Install: involved, per-vehicle install sheet · Afterward: alignment, headlamp aim, ADAS check
This kit installs using the steps in ReadyLIFT's instructions for this truck, including any trimming the instructions call for. Plan on a wheel alignment after installation and have headlamp aim checked. Vehicles with camera, radar or sonar driver-assistance systems need those systems checked and recalibrated, which can require dealer tools. ReadyLIFT recommends installation by a certified mechanic and says to read the full instructions before starting. Tire sizes are ReadyLIFT guidance based on specific wheel and tire brands, so test fit every combination. Larger E-rated tires have stiffer sidewalls than stock C-rated tires and can make the ride feel firmer.
ReadyLIFT estimates about 10 hours for this kit, give or take 1 hour, not counting the alignment or mounting wheels and tires.
ReadyLIFT's installation instructions for this part number are linked under Resources. Read them fully before starting.
Resources
Warranty, Shipping & Returns
Warranty. ReadyLIFT backs this product with its No Hassle warranty for the original purchaser: if a part breaks or arrives defective, ReadyLIFT ships a replacement, and a claim starts with a call to 800-549-4620. Wear items such as the included shocks, ball joints and bushings are covered for up to one year. Damage caused by off-road abuse voids coverage. Discontinued, clearance and outlet items are excluded, as are labor, installation charges and consequential vehicle damage. Shipping. The carrier and ship method are set by the size and weight of the cartons when the order is placed; larger kits ship by freight. Inspect on delivery. Check every box and part against the kit component list when it arrives, and report any shortage or shipping damage before installation begins.
Returns. Unused items in their original packaging can be returned within 30 days of delivery. If an item arrives damaged, defective or wrong, return shipping is on us. See our Returns & Refunds Policy, or email support@prestigetruck.com with any question.
About ReadyLIFT
ReadyLIFT Suspension started in 2006 with one goal: give truck and SUV owners more tire clearance and a better stance while keeping the ride and handling their vehicle had from the factory.
What began as a practical option to traditional big lifts now spans front leveling kits, SST mild lifts, full big lift systems, premium coilover packages, upper control arms and Falcon shocks for popular trucks and SUVs.
Wheel Pros bought ReadyLIFT in 2018, and in August 2026 the brand joined Bestop Premium Accessories Group, which plans continued investment in engineering, product development, manufacturing and customer support.
