ReadyLIFT ยท SKU 66-3921
ReadyLIFT 66-3921 1.75 inch GM AT4 and Trail Boss leveling kit
A factory-lift GM 1500 leveling kit for Trail Boss and AT4 trucks that need control-arm and strut-spacer geometry built around the OEM 2 inch lift.
Best price
$401.23
Seller price range
$401.23 - $529.95
Available sellers
6
Official docs
2
What to know before buying
This is the right first public GM 1500 leveling product because it solves a different problem from normal-height Silverado/Sierra spacer kits. Trail Boss and AT4 already have a factory front lift, so ReadyLIFT packages upper control arms with top and bottom strut spacers instead of pretending a generic 2 inch spacer is safe across every GM trim. Walmart and Amazon currently sit well below the direct reference price, while ReadyLIFT direct, AmericanTrucks, RealTruck, and eBay keep fitment, install, review, and seller-quality context visible. Use it when the buyer has a factory-lift Trail Boss or AT4 and can still pass the ZR2/AT4X, tire, wheel, CV boot, alignment, headlamp, and ADAS checks.
Best offer
Start with the lowest buyer-safe option, then use the seller menu to compare price, stock, reviews, and report links without losing the product details.
Best price
$401.23
Seller price range
$401.23 - $529.95
Available now
6 available sellers
Review before buying
Keep the manual, spec sheet, or closest install video handy while you compare seller fitment.
Best offer is listed first. Switch sellers to compare price, stock, and reviews before opening the retailer.
See selected offerAmazon
$404.87
Recent low $404.87 ยท At recent low
4.6 (132 reviews on Amazon product page)
Checked Jun 2026 ยท SKU 66-3921
Confirm the current Amazon seller ships the exact ReadyLIFT 66-3921 kit, UPC 804879610489, and not an adjacent GM leveling kit before checkout.
Jun 25, 2026
$404.87
Stock note
Amazon page showed $404.87, in-stock status, 54 buying options from $397.99, and a featured seller row for 4Wheel Online.
Deal note
Amazon showed the exact ASIN materially below the ReadyLIFT direct reference price, with Amazon's Choice context and enough review depth to make it a priority comparison row.
The seller menu above is the fastest way to switch offers. Open this list when you want to scan every price, stock note, review count, and report button together.
Amazon
$404.87
SKU 66-3921 ยท Recent low $404.87
4.6 (132 reviews on Amazon product page)
Confirm the current Amazon seller ships the exact ReadyLIFT 66-3921 kit, UPC 804879610489, and not an adjacent GM leveling kit before checkout.
Walmart
$401.23
SKU 66-3921 ยท Recent low $401.23
4.6 (62 reviews on Walmart product page)
Walmart item 290629470 names manufacturer product id 66-3921 and UPC 804879610489; verify the live selector because Walmart copy still carries older 2019-2022/2020 wording while ReadyLIFT direct is the fitment authority.
eBay Motors
$529.95
SKU 66-3921 ยท Recent low $529.95
5.0 (5 reviews on eBay product ratings)
Confirm eBay item 306313637380 is still new ReadyLIFT 66-3921, review Parts Supplies seller terms, and use ReadyLIFT direct for AT4X/ZR2 exclusions before checkout.
AmericanTrucks
$529.95
SKU 66-3921 ยท Recent low $529.95
4.9 (45 reviews on AmericanTrucks product page)
AmericanTrucks currently scopes the row to 2019-2026 Silverado 1500 Trail Boss models; use ReadyLIFT direct for Sierra AT4 and final exclusion checks.
ReadyLIFT
$529.95
SKU 66-3921 ยท Recent low $529.95
4.6 (132 reviews on Amazon exact-ASIN rating context)
Use ReadyLIFT direct as the fitment authority for 2019-2026 GM AT4 and Trail Boss factory-lift trucks; it excludes Sierra AT4X and Silverado ZR2 and requires post-install alignment, headlamp, and ADAS checks.
RealTruck
$529.95
SKU 66-3921 ยท Recent low $529.95
4.7 (39 reviews on RealTruck product page)
RealTruck currently shows a narrower 2019-2022 Chevy Silverado/GMC Sierra 1500 row; use the page for seller comparison and ReadyLIFT direct for the current 2019-2026 public fitment range.
Report a seller issue
Use the report button on any offer if the price, stock, seller link, or fitment note looks wrong.
Product details and install help
Specs, manuals, install help, seller context, and model-year notes stay together so you can make one clean buying decision.
Why we carry it
This lands in the middle of the similar-product price range, where current prices run $69.95 to $529.88 and this product has 6 seller options for this product. A lower-priced kit can make sense when the truck only needs a straightforward stance correction and the buyer is comfortable confirming exclusions, alignment needs, and installer labor. The expensive option earns a closer look when it brings control arms, better shocks or coilovers, clearer instructions, or a wider margin for ride quality and long-term wear. Compare it against Rough Country 1321 1.5 inch Chevy Silverado Trail Boss leveling kit on price and ReadyLIFT 69-3920 2 inch front with 1 inch rear GM AT4 and Trail Boss SST lift kit on features before deciding.
Best fit for Silverado Trail Boss and Sierra AT4 shoppers who need a leveling kit designed around factory-lift geometry.
Do not substitute normal-height GM 1500 spacer or loaded-strut products on Trail Boss/AT4 routes without exact product evidence.
Compare Walmart, Amazon, eBay, ReadyLIFT direct, and specialty sellers while refreshing seller stock, return terms, and exact SKU before checkout.
Compare nearby products
Use these as quick checks before paying more or chasing the cheapest listing. Some cards are category benchmarks when same-vehicle choices are thin; the right answer still depends on the exact truck, seller fitment note, and install plan.
Rough Country 1321 1.5 inch Chevy Silverado Trail Boss leveling kit
From $69.95 ยท 4 seller options
$331.28 lower before shipping. Compare it when total installed cost matters more than extra hardware, construction, or seller preference.
Open comparisonReadyLIFT 69-3920 2 inch front with 1 inch rear GM AT4 and Trail Boss SST lift kit
From $529.88 ยท 4 seller options
$128.65 higher before shipping. Compare it when clearer specs, added hardware, ride behavior, or extra margin matters more than the lowest checkout price.
Open comparisonProduct documents
Manuals, official specs, fitment guides, and warranty pages we would want open before buying.
ReadyLIFT 66-3921 product page
Official ยท Official product page ยท ReadyLIFT
ReadyLIFT 66-3921 installation instructions
Official ยท Install instructions ยท ReadyLIFT
Walmart ReadyLIFT 66-3921 seller page
Reference ยท Retail spec page ยท Walmart
Amazon ReadyLIFT 66-3921 product page
Reference ยท Retail spec page ยท Amazon
eBay ReadyLIFT 66-3921 marketplace listing
Reference ยท Retail spec page ยท eBay Motors
Install videos matched to this vehicle
Videos are sorted for 2024 Chevrolet Silverado 1500 LT Trail Boss 4x4 Crew Cab; start with the closest match, then compare product-family clips before scheduling the install.
ReadyLIFT 66-3921 Silverado install video
Install-video context for the 66-3921 Trail Boss/AT4 product family; final torque, CV boot, alignment, and ADAS checks still come from ReadyLIFT instructions.
Specs to verify
Front lift
1.75 inches
Install type
Top and bottom strut spacers with tubular upper control arms
Core fitment
2019-2026 GM AT4 and Silverado Trail Boss factory-lift 1500 trucks according to ReadyLIFT direct
Tire guidance
Trail Boss max 295/65R20 on 20x9 0 offset; AT4 max 275/60R20 on 20x9 0 offset
Install caution
Certified mechanic recommended; alignment, headlamp aim, ADAS checks, CV boot care, and 500-mile hardware recheck remain required
Compatibility by model year
Year range is only the first pass. The final answer still depends on model, trim, body style, drive, suspension package, and current seller fitment data.
2019-2026 Silverado 1500 Trail Boss, excluding ZR2
Use on Silverado 1500 Trail Boss factory-lift trucks when the current ReadyLIFT or seller selector confirms the exact year, cab, drive, and trim. The product is not a normal-height Silverado spacer kit.
Checked trim pages
LT Trail Boss 4x4 Crew Cab
Trim and body style
The checked public route is a 2024 LT Trail Boss 4x4 Crew Cab. Custom Trail Boss, other cabs, older overlapping body styles, dealer-lift trucks, aftermarket lifts, and ZR2 need current seller and installer checks before inheriting this answer.
Engine and powertrain
ReadyLIFT and marketplace fitment rows are not engine-only for this route; final checkout should still confirm the buyer's 2.7L, 3.0L Duramax, 5.3L, or 6.2L configuration in the live selector.
Model-year notes
The 2019 Silverado/Sierra redesign created a distinct fourth-generation GM 1500 platform. Keep this product on factory-lift Trail Boss/AT4 applications and do not reuse older K2, LD/Limited, ZR2, or normal-height kit assumptions.
What to double-check
ReadyLIFT direct carries the current 2019-2026 product range while some retailer rows still show older 2019-2022 or 2019-2025 wording; preserve the direct range and require live seller confirmation.
Included
- Silverado 1500 Trail Boss factory-lift candidates
- Buyers comparing control-arm leveling kits for factory-lift GM 1500 trucks
- Trail Boss tire planning up to ReadyLIFT's 295/65R20 note when wheel and test-fit checks agree
Excluded
- Silverado ZR2
- Normal-height Silverado trims using different leveling geometry
- Aftermarket lift struts or additional lift components stacked with this kit
Check before buying
- Exact 66-3921 SKU and UPC 804879610489
- Trail Boss trim and current seller selector
- Wheel/tire test fit, CV boot care, alignment, headlamp aim, ADAS calibration, and 500-mile recheck
2019-2026 Sierra 1500 AT4, excluding AT4X
ReadyLIFT direct names GM AT4 trucks for 66-3921, but this PR promotes the checked Silverado Trail Boss route first. Add a public Sierra AT4 route only after seller pages and vehicle copy are checked without duplicating identical seller rows.
Checked trim pages
AT4 Crew Cab 4x4
Trim and body style
AT4 factory-lift trucks are inside the official product family, while AT4X, Denali adaptive ride paths, normal-height Sierra trims, older-body overlap, and aftermarket lift systems need separate checks.
Engine and powertrain
Treat engine coverage as selector-confirmed rather than engine-specific until a Sierra AT4 public route captures current seller tables for the buyer's exact engine.
Model-year notes
Keep Sierra AT4 compatibility tied to the 2019-2026 GM 1500 redesign and factory-lift suspension. It is not evidence for older K2 trucks, LD/Limited models, AT4X, or normal-height Sierra kits.
What to double-check
ReadyLIFT direct carries current AT4 fitment while marketplace rows can lag or omit GMC wording, so Sierra promotion should refresh direct, seller, and installer evidence together.
Included
- Sierra 1500 AT4 factory-lift candidates after live seller confirmation
- AT4 shoppers comparing control-arm leveling kits
- AT4 tire planning up to ReadyLIFT's 275/60R20 note when wheel and test-fit checks agree
Excluded
- Sierra AT4X
- Normal-height Sierra trims
- Aftermarket lift struts or additional lift systems stacked with this kit
Check before buying
- Exact Sierra AT4 trim and current seller selector
- AT4X/adaptive-ride/lift-system exclusions
- Wheel/tire test fit, CV boot care, alignment, headlamp aim, ADAS calibration, and 500-mile recheck
Before checkout
Confirm the seller fitment selector, current stock, shipping, return terms, and any programming, alignment, trimming, or installer requirements.