ReadyLIFT 4” Big Lift Kit – Chevy Silverado Trail Boss / GMC Sierra AT4 1500 (2025)

The ReadyLIFT 4” Big Lift Kit is designed for the new generation Chevrolet Silverado Trail Boss and GMC Sierra AT4 1500 (2025).

The kit uses ReadyLIFT’s best engineering solutions, including reinforced crossmembers (crossmembers), differential brackets (diff drop brackets) and precisely designed suspension geometry, to deliver a better-than-factory ride and excellent stability.

The system allows tyres up to 35” to be fitted and is ideal for both everyday use and off-roading.

⭐ Key Features

• Lift: 4” (≈10 cm)

• Suitable for tyres up to 35”

• Improved ride over factory

• Excellent stability and control

• ReadyGuard warranty

🔧 Equipment

• Front and rear crossmembers (crossmembers) – reinforced steel

• Front skid plate (skid plate) – 3/16” steel

• Differential brackets (diff drop brackets) – reinforced

• Upper strut extensions (strut extensions)

• Lower preload spacers (pre-load spacers)

• Rear lift blocks (rear lift blocks)

• Falcon rear shocks (rear shocks)

🔗 Compatibility

• Chevy Silverado 1500 Trail Boss (2025)

• GMC Sierra 1500 AT4 (2025)

• 4WD only

• Petrol models only

📦 What’s in the Box

• Complete lift kit

• Crossmembers and mounting hardware

• Rear blocks and hardware

• All required mounting components

📊 Technical Specifications

• Type: lift kit (big lift kit)

• Lift: 4”

• Max. tyres: up to 35×12.50

• Wheels:

  • Recommended: 20×9 / 0 offset

  • With trimming: down to -18 offset

• Suspension: strut spacer + blocks

⚙️ Benefits

• Improves comfort and handling

• Better stability at high speed

• Suitable for off-road and harsh conditions

• Retains correct geometry

• Tested for durability and reliability

⚠️ Important

• Not compatible with:

  • diesel versions

  • rear mono-leaf springs

• Use of Auto 4 Hi mode is not recommended

• Not suitable for 18” wheels

• Single Cab is not validated

• Check your suspension configuration before purchase