4'' Big Lift Kit 2025 1500 Trail Boss / AT4
This lift kit utilizes the very best in ReadyLIFT engineering with boxed steel front/rear cross members and full-width front skid plate constructed of thick 3/16" plate steel. New 1/4-inch boxed plate steel differential drop brackets feature a double gusset and boxed center rib to take the abuse of front differential torsional twisting.Our 4" lift kit features heavy-duty angled and offset top mount strut extensions that realigns the struts to optimize shock performance and minimize wear. A specially designed lower mount strut pre-load spacer offers the added benefit of a slight increase in spring rate to better handle the larger wheels and tires that will find their way onto this new lifted truck. To lift the rear, new fabricated steel rear blocks with integrated bump stop landings have been added as well as new rear shock extensions.With months of engineering and development and more awesome features than we could possibly mention, the bottom line is this new Big Lift Kit is the best 4" lift kit you can install on a new body style 2025 GM 1500 4WD truck! Thousands of miles of road and trail testing have proven our new 4" lift kit makes these new GM 1500 trucks ride better than stock! Wheel and tire fitment information: 6" Lift Kit - Recommended max tire with no trimming: 20x9 0 offset - 35x12.50 tire. *Max with trimming: 20x10 -18 offset - 35x12.50 or 325/60R20 *Trimming requirements for larger than recommended wheel/tire include front valance, front felt liner edge, rear felt liner edge and front-rear well edge mud flap.
- ReadyLIFT now offers an all-new 4" Big Lift Kit for the new 2025 Chevy Silverado Trail Boss and GMC AT4 1500 trucks engineered for incredible ride quality and superior handling performance. Includes ReadyGuard Powertrain Warranty.
- Note: Use of Auto 4 Hi feature not recommended. Not compatible with rear mono-leaf springs. Single Cab configuration has not been validated for fitment & drivability by ReadyLIFT. Not for use on Diesel motor applications.
- Note: Do not recommend an 18" wheel due to fitment issues. A 18x9 with 0mm offset or higher does not work.
Application Summary:
| Year |
Make/Model |
| 2025 |
Chevrolet Silverado 1500 |
| 2025 |
GMC Sierra 1500 |
| Attributes |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
| Color |
Black |
| Country of Origin (Primary) |
US |
| Fitment |
Direct Fitment |
| Front Lift Component |
Coil Spring Spacer |
| Front Lift Height |
4 Inches |
| Front or Rear |
Front and Rear |
| GTIN |
00194933406128 |
| Harmonized Tariff Code (Schedule B) |
8708801600 |
| Hazardous Material Code |
N |
| Install Difficulty |
Difficult Requires Professional Installation |
| Installation Time |
5+ Hours |
| Life Cycle Status Code |
Available to Order |
| Lift/Drop Height |
4 in. |
| Max Tire Size |
35 Inch |
| NAFTA Preference Criterion Code |
B |
| Rear Lift Component |
Block and U-bolt |
| Rear Lift Height |
3 Inches |
| SDR Required Flag |
N |
| Shocks Included |
No |
