## Product Summary<\/p>\n
| Field | Details |
\n|—|—|
\n| Brand | ReadyLIFT |
\n| Part Number | RL4435425 |
\n| Fitment Type | Performance\/Custom |
\n| Adjustable | No |
\n| Performance Part | Yes |
\n| Country of Origin | United States |
\n| Vehicle Placement | Left, Right, Front, Rear |
\n| Lift | 4-inch Big Lift Kit |
\n| Warranty | ReadyGuard Powertrain Warranty |<\/p>\n
## Compatible Vehicles<\/p>\n
| Year | Make | Model | Trim | Engine |
\n|—|—|—|—|—|
\n| 2025\u20132026 | Chevrolet | Silverado 1500 | Custom Trail Boss Crew Cab | 2.7L I4 Turbo Gas |
\n| 2025\u20132026 | Chevrolet | Silverado 1500 | Custom Trail Boss Crew Cab | 3.0L I6 Turbo Diesel |
\n| 2025\u20132026 | Chevrolet | Silverado 1500 | Custom Trail Boss Crew Cab | 5.3L V8 Gas |
\n| 2025\u20132026 | Chevrolet | Silverado 1500 | LT Trail Boss Crew Cab | 2.7L I4 Turbo Gas |
\n| 2025\u20132026 | Chevrolet | Silverado 1500 | LT Trail Boss Crew Cab | 3.0L I6 Turbo Diesel |
\n| 2025\u20132026 | Chevrolet | Silverado 1500 | LT Trail Boss Crew Cab | 5.3L V8 Gas |
\n| 2025\u20132026 | Chevrolet | Silverado 1500 | LT Trail Boss Crew Cab | 6.2L V8 Gas |
\n| 2025\u20132026 | GMC | Sierra 1500 | AT4 Crew Cab | 3.0L I6 Turbo Diesel |
\n| 2025\u20132026 | GMC | Sierra 1500 | AT4 Crew Cab | 6.2L V8 Gas |<\/p>\n
## Kit Includes<\/p>\n
| Component | Included |
\n|—|—|
\n| Front\/rear cross members | Yes |
\n| Full-width front skid plate | Yes |
\n| Differential drop brackets | Yes |
\n| Top-mount strut extensions | Yes |
\n| Lower strut pre-load spacers | Yes |
\n| Rear lift blocks | Yes |
\n| Rear shock extensions | Yes |
\n| Sway-bar drop brackets | Yes |
\n| Cast-iron lift knuckles | Yes |
\n| Hardware & installation instructions | Yes |<\/p>\n
## Important Fitment Notes<\/p>\n
– **Not for diesel applications**, despite the compatibility table listing diesel engines.
\n– **Not compatible with rear mono-leaf springs.**
\n– **Single Cab configuration has not been validated** for fitment or drivability.
\n– Use of **Auto 4 Hi is not recommended**.
\n– An **18-inch wheel is not recommended** because of fitment issues.
\n– An **18×9 wheel with 0 mm offset or higher does not work**.
\n– Recommended maximum tire setup without trimming: **20×9 wheel, 0 offset, 35×12.50 tire**.
\n– Larger wheel\/tire combinations may require trimming of the front valance, front\/rear felt liner edges, and mud-flap\/wheel-well areas.<\/p>\n
## Answer<\/p>\n
**This is ReadyLIFT part RL4435425, a 4-inch lift kit designed for 2025\u20132026 Chevrolet Silverado 1500 Trail Boss and GMC Sierra 1500 AT4 Crew Cab 4WD trucks.**<\/p>\n
**The key issue is the diesel compatibility conflict:** the supplied vehicle-compatibility table lists the **3.0L Duramax diesel**, but the seller’s own description explicitly states **\u201cNot for use on Diesel motor applications.\u201d** Therefore, based on the information provided, **do not consider this kit compatible with the 3.0L diesel**, even though the compatibility table says it is.<\/p>\n
For gas-powered trucks, the listed compatible configurations are:
\n– 2.7L Turbo I4
\n– 5.3L V8
\n– 6.2L V8<\/p>\n
The kit provides approximately **4 inches of lift** using front strut extensions, differential-drop components, lift knuckles, rear lift blocks, shock extensions, sway-bar brackets, and heavy-duty crossmembers\/skid plate.<\/p>","protected":false},"excerpt":{"rendered":"
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