Tuff Country 14990KN 4" Lift Kit with Knuckles and 1 Piece Sub-Frame with SX8000 Shocks
Tuff Country
14990KN
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Limited Lifetime Warranty
Made in the USA
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Tuff Country 14990KN 4" Lift Kit with Knuckles and 1 Piece Sub-Frame with SX8000 Shocks
Product Details
Description
Elevate your heavy-duty Chevy or GMC with the Tuff Country 14990KN 4" Lift Kit with Knuckles and 1 Piece Sub-Frame and SX8000 Shocks. Designed for 2001–2006 Chevy Silverado 3500 4WD and GMC Sierra 3500 4WD, this bolt-on kit adds reliable height and improved steering geometry, while supporting larger tire options for all-terrain capability.
- Lift Height: 4" front / 2" rear (levels front with rear) to achieve a balanced, aggressive stance.
- Knuckles: New steering knuckles that eliminate the need to drop upper control arms for easier installation and better steering linkage geometry.
- One-Piece Sub-Frame: Increased rigidity to reduce squeaks and rattles while enhancing overall chassis strength.
- Shocks Included: SX8000 shocks are included to deliver consistent damping and control across on-road and off-road conditions.
- Tire Compatibility: Enables fitment of 33" x 12.5" tires for expanded ground clearance and improved traction.
- Rim/Backspacing: Requires rims with 4.5" backspacing or less; factory rims will not fit with this lift kit.
- Warranty: Backed by Tuff Country’s Limited Lifetime Warranty for long-term confidence.
- Made in the USA: Built with American manufacturing standards and supported by a strong brand legacy.
- Installation Time: Typical installation takes about 8–10 hours, providing a straightforward bolt-on process for a weekend project.
- Vehicle Fitment: Specifically designed for 2001–2006 Chevy Silverado 3500 4WD and GMC Sierra 3500 4WD; not compatible with Stabilitrak-equipped models and not intended for dually (dually) configurations.
With this lift kit installed, you’ll enjoy a commanding stance, increased ground clearance for rough terrain and towing, and the stability of a rigid, well-balanced chassis. The knuckles improve steering accuracy and reduce bump steer, while the one-piece sub-frame enhances durability and quietness on rough roads. The SX8000 shocks deliver dependable damping across everyday driving and off-road adventures, backed by a Limited Lifetime Warranty for long-term peace of mind. This kit is an ideal, practical upgrade for 1-ton pickups that value real-world performance, reliability, and value.
| Year Range | Make | Model | Drivetrain | Fitment Note |
|---|---|---|---|---|
| 2001-2006 | Chevy | Silverado 3500 | 4WD | Will Not Fit Dually Models. |
| 2001-2006 | GMC | Sierra 3500 | 4WD | Will not fit dually model |
Specifications:
Packaging Details
FAQs
Please read our FAQs page to find out more.
Will this part fit my vehicle?
Fitment varies by year, make, model, drivetrain, and lift height. Always use the vehicle fitment selector or refer to the fitment notes on the product page before purchasing. If you’re unsure, our team can help confirm compatibility.
Are Tuff Country products street legal?
Most Tuff Country products are designed for on-road and off-road use, but local laws and regulations vary by state and country. It is the customer’s responsibility to ensure compliance with local vehicle regulations after installation.
Is professional installation required?
Professional installation is recommended but not required. Many products can be installed by experienced DIYers with proper tools. However, improper installation can affect ride quality, safety, and warranty coverage.
Will this affect my ride quality?
Tuff Country products are engineered to balance ride comfort, performance, and durability. Ride quality can change depending on lift height, vehicle setup, tire size, and other suspension components.
Are Tuff Country products covered by a warranty?
Yes. Tuff Country products are backed by a manufacturer warranty that covers defects in materials and workmanship. Warranty terms vary by product type and do not cover damage caused by misuse, improper installation, or normal wear.
Can I run larger tires with this product?
Many Tuff Country lift kits and suspension components allow for larger tire sizes, but maximum tire clearance depends on wheel offset, tire width, and vehicle configuration. Refer to the product details or contact support for guidance.
What is the return policy?
Unused, uninstalled products may be eligible for return within the stated return window. Items must be in new condition and returned in original packaging. Shipping costs and restocking fees may apply.
Who can I contact if I have questions?
Our customer support team is available to help with fitment questions, installation guidance, and order support. Reach out before purchasing if you want to ensure you’re selecting the right part for your build.
Free shipping on Orders Over $75
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Selling Suspension Systems for 35+ Years
Tuff Country EZ-Ride Suspension was incorporated over 35 years ago, realizing the desperate need for quality suspension products in the after market world.