Description
Fits
Year | Make | Model |
2019 - 2021 | GMC/Chevrolet | 1500 |
ReadyLift spent over 9 months on engineering and development. This amazing Big Lift Kit is the top - notch 6' lift kit for your 1500 4WD truck! It has 1/4' boxed plate steel differential drop brackets with double gussets and a boxed center rib to handle front differential torsional twisting. The HD angled and offset top mount strut extensions realign struts, boost shock performance, and reduce wear.
Part Number: 44 - 3960 / 44 - 39600
Features
- HD front - rear cross members
- HD skid plate
- HD top mount strut extensions
- Sway bar drop brackets
- HD fab steel rear lift blocks with bump stop landings
- HD cast iron lift knuckles for factory - like geometry
- Choose between Bilstein 5100 series rear shocks or Falcon 1.1 Monotube shocks
- Comes with all necessary hardware and instructions
Tire Fitment:
- 20x9 0 offset - 35x12.50 tire
- Max with trimming: 20x10 - 18 offset - 35x12.50 or 325/60R20
- Trimming may be needed on front valance, front and rear felt liner edges, and front rear well edge mud flap for larger wheel/tire combos.
Notes
- Don't use the Auto 4 Hi feature.
- Not for Adaptive Ride Control or Multimatic vehicles.
- Not compatible with vehicles having rear composite mono - leaf springs. This kit works only with traditional steel leaf springs.
Installation
Click here for installation instructions

This lift kit is designed for 2019 - 2021 GMC/Chevrolet 1500 trucks. To use it, first make sure your vehicle meets the compatibility requirements. Check if it has traditional steel leaf springs, as the kit won't work with rear composite mono - leaf springs. Also, avoid using the Auto 4 Hi feature and don't install it on Adaptive Ride Control or Multimatic vehicles. When it comes to tire fitment, you can use 20x9 0 offset - 35x12.50 tires. If you want larger ones, you may need to do some trimming on parts like the front valance and felt liner edges. Installation comes with all the necessary hardware and instructions. Just click the link provided for detailed steps. For maintenance, regularly check the HD components like cross - members, skid plates, and strut extensions for any signs of wear or damage. Keep the shocks in good condition by following the manufacturer's guidelines for the Bilstein 5100 series or Falcon 1.1 Monotube shocks you choose.