4 Inch Lift Kit AT4/Trailboss | Chevy/GMC 1500 (19-23)

Rough Country
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GM’s 2019 silverado and sierra features an impressive all-new design that’s built from the ground up, with aggressive angles and head-turning stylings that fit in beautifully when transformed with Rough Country’s 4in Suspension Lift for Trailboss / AT4 models.

This kit lifts and levels your vehicle for a commanding stance and enough clearance to run 35x12.50 tires on 10in wide wheels. Rough Country has engineered this kit to provide optimal suspension geometry while retaining the factory ride quality, giving you enhanced off-road capabilities without sacrificing the handling and smooth ride that makes this truck so impressive.

Rough Country’s 4in Suspension lift retains the stock track width, allowing for up to a 10in wide wheel with 4.5in backspacing. Each kit includes front and rear crossmembers and a skid plate for enhanced chassis strength as well as cast steel knuckles for incredible durability and performance. Includes Rough Country’s Lifetime Replacement Guarantee!


  • Lifts and levels the vehicle from front to rear
  • High clearance crossmember design for optimal suspension geometry
  • Includes cast knuckles for extreme durability
  • Retains stock track width
  • No strut disassembly required
  • No differential trimming required!
  • 100% precision laser cut materials using the latest computer aided design process.
  • Fabricated blocks are stronger and offer a longer lifespan than cast blocks.
  • Includes application valved N3 series shock absorbers which offer the best in balanced performance for on and off-road use.
  • Optional N3 Loaded Struts

  • Includes pre-loaded coil
  • Maintains smooth, factory-like ride
  • Increased ground clearance
  • Engineered for lifted applications
  • Infinitely Variable Damping
  • Leak-proof piston seal
  • Massive 1 3/8in Bore
  • Silver powder coat finish
  • 3-year Manufacturer's Warranty
  • Optional V2 Monotube Shocks

  • Monotube design
  • Internal floating piston
  • Nitrogen-charged
  • 46mm high-flow piston
  • Fast heat dissipation
  • 36kN Tensile Strength
  • Mounts inverted
  • T6061 brushed aluminum body
  • 3-year Manufacturer's Warranty
  • Optional Vertex

  • 8-Stage Adjustable Damping
  • Monotube Design
  • Nitrogen-charged
  • Massive 2.5in Piston
  • 22mm Chrome-Hardened Piston Rod
  • 3-Stage Seal System
  • Heat-Treated, Alloy Bearing
  • Honed Steel Body
  • 3-year Manufacturer's Warranty

Notes - Important

  • Does NOT fit GMC Denali models with Magnetic Ride Control.
  • Does NOT fit models equipped with Multimatic DSSV suspension. (AT4X)
  • Does NOT fit models with two piece rear driveshaft.
  • Does NOT fit 2019 "Classic" models (2018 body style)
  • ONLY fit Trailboss models (Chevy)
  • ONLY fits AT4 models (GMC)
  • Does NOT fit standard models or other trims (GMC)
  • Does NOT fit models with equipped with composite leaf springs.
  • Requires cutting and drilling.

  • Tire & Wheel Details

  • Does NOT fit factory wheels
  • 20-inch or larger aftermarket wheels are required.
  • Wheels must feature 4.5in backspacing to fit
  • Please test fit wheels prior to installation
  • Must verify compatibility of the aftermarket wheel with the 2019 and up GM larger brake caliper system.
  • Some aftermarket wheels may require .25" wheel spacer #1065.


More Information
Est. Install Time8-10 hours

In the Box

  • Lifted knuckles
  • Front crossmember
  • Rear crossmember
  • Upper strut spacers
  • Lower strut spacers
  • Differential drop brackets
  • Differential skid plate
  • Sway-bar drop brackets
  • Hardware
  • Fabricated lift blocks
  • Brake line brackets
  • U-bolts
  • Hardware
  • (2) Rear Premium N3 series


Vehicle Fitment

2019-2022 4WD Chevy Silverado 1500
2019-2023 4WD GMC Sierra 1500
ALWAYS read all product page details for more important fitment information

Recommended Tires & Wheels

TireWheelBolt PatternOffsetNote
35x12.50R2020x96x5.5-60.25 Spacer
295/65R2020x96x5.5-60.25 Spacer
35x12.50R2020x106x5.5-25Minor Trimming
35x12.50R2020x106x5.5-24Minor Trimming
35x12.50R2020x106x5.5-19Minor Trimming
35x12.50R2020x106x5.5-18Minor Trimming
35x12.50R2020x126x5.5-44Trimming Required
35x12.50R2222x106x5.5-25Minor Trimming
35x12.50R2222x106x5.5-24Minor Trimming
35x12.50R2222x106x5.5-19Minor Trimming
35x12.50R2222x106x5.5-18Minor Trimming
35x12.50R2222x126x5.5-44Trimming Required
Does NOT fit factory wheels
0.25” wheel spacer may be required with some aftermarket wheel configurations.
Due to differences in manufacturing, dimension and inflated measurements, tire and wheel combinations should be test fit prior to installation



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Select a wheel size to view custom wheels and tires for this kit. You can find that on the sidewall of the tires on your original wheels or the inside frame of the driver's door.

Does NOT fit factory wheels
0.25” wheel spacer may be required with some aftermarket wheel configurations.
Please select your wheel size above
We cannot accept returns for wheels or tires once they have been mounted. Return policy