ReadyLIFT customers have asked for it and we have delivered. In fall of 2018 we announced our new leveling and SST lift kit offerings for the all-new GM 1500 trucks. We specifically did not include the factory lift kit-equipped GMC AT4 and Chevy Silverado Trail Boss. The AT4/Trail Boss are factory equipped with a 2" front lift. This front lift includes a longer front shock/strut assembly. When combining a traditional leveling kit on these factory lifted trucks, several issues present themselves including binding problems with the factory control arm ball joint and contact concerns with the lower strut/CV axle assembly. The ReadyLIFT 66-3921 1.75" leveling kit is similar to our popular 66-3086 leveling kit for pre-2019 trucks. The 66-3921 leveling kit provides required amount of lift without causing conflict with the factory strut geometry and clearances. In light of the factory upper control arm's lack of dynamic range when the AT4/Trail Boss truck is further lifted, this leveling kit includes our popular tubular upper control arms with corrected ball joint cup angles, heavy-duty replaceable ball joints and out new Terrain Control Technology (TCT) maintenance-free pivot bushings with side-biter washers to improve alignment retention. Note: AT4 and Trail Boss do not fit the same size tire. This is due to the difference in front fender opening design. NOTE: Not compatible with Sierra AT4X or Silverado ZR2 Edition. 66-3921 Leveling Kit: AT4 - Max tire 275/60-20, 20x9 0 offset wheel Trail Boss - Max tire 295/65-20, 20x9 0 offset wheel
The ReadyLift 66-3921 suspension leveling kit is designed specifically for 2019-2023 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks, providing a reliable and safe way to achieve a 1.75-inch front lift. This kit is ideal for owners seeking to improve vehicle stance and accommodate larger tires without compromising factory suspension geometry. Crafted to deliver a level ride, it ensures enhanced vehicle appearance and functionality while maintaining ride quality and handling characteristics.
The kit features high-quality spacers made from durable materials that install in the front suspension, providing the desired lift while preserving factory control arm angles. Included are tubular upper control arms with corrected ball joint cup angles, heavy-duty replaceable ball joints, and terrain control technology (TCT) maintenance-free pivot bushings with side-biter washers. These components work together to improve alignment retention and longevity, especially when running larger tires.
Designed to fit specific factory models, the kit is compatible with trucks equipped with factory 2-inch lifts such as the AT4 and Trail Boss, but it does not fit Sierra AT4X or Silverado ZR2 editions. For the AT4, the maximum tire size is 275/60-20 with 20x9 wheels at 0 offset, while the Trail Boss can accommodate up to 295/65-20 tires with similar wheel specifications. The installation requires professional expertise and approximately 4 hours to complete, making it a suitable upgrade for serious truck enthusiasts seeking improved aesthetics and off-road capability.
Please note that this product contains chemicals known to cause reproductive harm under California Proposition 65 regulations. Proper installation is critical for safety and optimal performance, and users should ensure compliance with local regulations when installing and using this leveling kit.
Features:
- 1.75-inch front lift: Provides a level stance and accommodates larger tires.
- High-quality spacers: Durable construction for long-lasting performance.
- Tubular upper control arms: Correct ball joint cup angles for improved alignment.
- Heavy-duty replaceable ball joints: Enhance durability and serviceability.
- Terrain Control Technology (TCT): Maintenance-free pivot bushings with side-biter washers for better alignment retention.
- Designed for specific GM 1500 models: Fits 2019-2023 Chevrolet Silverado and GMC Sierra trucks.
- Compatibility with factory 2-inch lifts: Suitable for AT4 and Trail Boss models.
- Professional installation recommended: Approximate installation time of 4 hours.
- Max tire sizes: 275/60-20 for AT4, 295/65-20 for Trail Boss.
- California Proposition 65 Warning: Contains chemicals that may cause reproductive harm.
Fitment:
Chevrolet Silverado 1500 2019
Chevrolet Silverado 1500 2020
Chevrolet Silverado 1500 2021
Chevrolet Silverado 1500 2022
Chevrolet Silverado 1500 2023
Chevrolet Silverado 1500 2024
Chevrolet Silverado 1500 2025
GMC Sierra 1500 2019
GMC Sierra 1500 2020
GMC Sierra 1500 2021
GMC Sierra 1500 2022
GMC Sierra 1500 2023
GMC Sierra 1500 2024
GMC Sierra 1500 2025
At KOVA OFFROAD, we aim to get your order to you as quickly as possible.
Most orders ship within 3-5 business days. For backordered items, please allow 2-3 weeks.
If you need your product urgently, our support team is ready to assist you.
Enjoy free shipping on orders over $200, and track your order in real-time once it’s on the way.
Returns & Exchanges
- All returns must be authorized by KOVA Offroad before an item is shipped back.
- Return eligibility and timeframes may vary by manufacturer and product.
- Products must generally be unused, uninstalled, in new and resellable condition, and returned with all original packaging, hardware, and documentation.
- Original shipping charges are non-refundable unless the return is the result of an error or a confirmed defective product.
- Customers may be responsible for return shipping and any manufacturer or supplier restocking fees that apply.
- Do not ship a return to KOVA Offroad or directly to a manufacturer without receiving return authorization and return instructions from us first.
Obtaining Return Authorization
- Contact KOVA Offroad at sales@kovaoffroad.com with your order number, product information, and reason for the return.
- We will provide the appropriate return instructions and shipping location after the return has been approved.
- Returns sent without authorization may be refused or delayed.
Warranty & Defective Products
- Product warranties are provided by the individual manufacturer and vary by brand and product.
- KOVA Offroad does not independently manufacture or warrant third-party products, but we will assist customers with the warranty claim process whenever possible.
- If you believe a product is defective, contact us with your order number, a description of the issue, and photos or video if applicable.
- Warranty approval, replacement, repair, shipping costs, and claim requirements are subject to the manufacturer’s warranty policy.
- Do not return a defective product until return or warranty instructions have been provided.
Order Cancellations & Changes
- Contact us as soon as possible if you need to change or cancel an order.
- Once an order has entered processing or shipped, cancellation may no longer be possible.
- Special-order, custom, made-to-order, clearance, or certain manufacturer-direct products may not be cancellable or returnable.
- Any applicable cancellation or restocking fees will be communicated before the return or cancellation is completed.
Fitment
- Customers are responsible for reviewing the listed vehicle fitment before purchasing.
- If a customer is unsure whether a product fits their vehicle, they should contact KOVA Offroad before ordering, and we will help verify compatibility.
Questions?
Call us at (800) 507-0672 or email sales@kovaoffroad.com.
