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Readylift Suspension

ReadyLift Suspension Leveling Kits 66-3921 Kit, Strut Extension, Tubular Control Arms, Front, 1.75 in. Lift, Chevrolet, GMC, Kit

SKU: RLS66-3921

Suspension Leveling & Lift Kits
ReadyLift Suspension Leveling Kits 66-3921 Kit, Strut Extension, Tubular Control Arms, Front, 1.75 in. Lift, Chevrolet, GMC, Kit

Readylift Suspension

ReadyLift Suspension Leveling Kits 66-3921 Kit, Strut Extension, Tubular Control Arms, Front, 1.75 in. Lift, Chevrolet, GMC, Kit

SKU: RLS66-3921

Suspension Leveling & Lift Kits
A$1,190.61
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

ReadyLift Suspension leveling kits are the fastest, safest, and least expensive way to level your truck or make room for oversized wheels and tires as large as 37 in. on most full size trucks (varies by vehicle).

Regardless of your suspension, get up to 3 in. of lift without a major hassle or sacrificing ride quality and comfort. ReadyLift thoroughly tests each kit to ensure that your truck will be leveled without overloading or adding excessive strain to any of your factory suspension components.

Additional features of ReadyLift Suspension leveling kits:

* Custom-designed for your specific year, make, and model
* Ideal for eliminating sag caused by a winch, heavy bumper, or plow
* Most kits cost 1/3 less than their competition.
* Fast, simple installation takes about 1/3 the time of other kits
* Steel kits have a durable powdercoated finish
* Aluminum kits are corrosion-resistant
* Coil spring spacers, expertly indexed forged torsion key spacers, and steel tower extensions are available
* Custom, progressive-wound coil springs are offered for specific applications
* Torsion keys have up to a 100 rating on the Rockwell(B) index scale, 25 percent stronger than most OEM torsion keys
* All mounting hardware is included

Note: A wheel alignment is recommended after installation of your new ReadyLift leveling kit.

Part Type

19- Chevy Trail Boss 1.75in Leveling Kit

Data: v4.2 - Upd: 2026-09-29 18:23:54

Specifications

Product Attributes - Brand
ReadyLift Suspension
Product Attributes - Manufacturer's Part Number
66-3921
Product Attributes - Part Type
Suspension Leveling & Lift Kits
Product Attributes - Product Line
ReadyLift Suspension Leveling Kits
Product Attributes - UPC
804879610489
Product Attributes - Lift Style
Suspension Leveling Kit
Product Attributes - Primary Front Lift Component
Strut extension
Product Attributes - Front Shocks/Struts Included
No
Product Attributes - Rear Shocks/Struts Included
No
Product Attributes - Brake Lines Included
No
Product Attributes - Hardware Included
Yes
Product Attributes - FMVSS 126 Certification
No
Product Attributes - Quantity
Sold as a kit.

Reference Information

Brand Name/s Readylift Suspension
StreetFX SKU rls66-3921
SFX Item ID 5008963
Supplier Item Code 5008963
Manufacturer SKU 66-3921
Manufacturer UPC 804879610489
Alternative References RDY66-3921

Compatibility

Application Data
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4
    Beginning Year2019
    Ending Year2024
    Engine TypeV8
    Liter6.2
    CID376
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeL
    CC6162
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4
    Beginning Year2020
    Ending Year2021
    Engine TypeL6
    Liter3.0
    CID183
    CC2993
    Engine Size3.0L/183
    Engine FamilyDuramax diesel inline 6-cylinder
    Drivetrain4WD
    Engine VIN CodeT
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4
    Beginning Year2023
    Ending Year2024
    Engine TypeL6
    Engine FamilyDuramax diesel inline 6-cylinder
    Drivetrain4WD
    Amount of Lift Front1.750 in.
    Amount of Lift RearNone
    Front SuspensionIndependent front suspension
    Number of Lugs6
    Maximum Tire Height (in.)35 in.
    Maximum Tire Width (in.)(application)12.0 in.
    Application NotesThis kit allows for up to 295/65-20 tire on a 20x9 0 offset wheel.
    Fuel TypeGAS
    Liter3.0
    CID183
    CC2993
    Engine Size3.0L/183
    Engine VIN Code8
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4X
    Beginning Year2024
    Ending Year2024
    Engine TypeL6
    Engine FamilyDuramax diesel inline 6-cylinder
    Drivetrain4WD
    Amount of Lift Front1.750 in.
    Amount of Lift RearNone
    Front SuspensionIndependent front suspension
    Number of Lugs6
    Maximum Tire Height (in.)35 in.
    Maximum Tire Width (in.)(application)12.0 in.
    Application NotesThis kit allows for up to 295/65-20 tire on a 20x9 0 offset wheel.
    Fuel TypeGAS
    Liter3.0
    CID183
    CC2993
    Engine Size3.0L/183
    Engine VIN Code8
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4X
    Beginning Year2024
    Ending Year2024
    Engine TypeV8
    Liter6.2
    CID376
    CC6162
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeL
  • MakeGMC
    ModelSIERRA 1500 LIMITED
    SubmodelAT4
    Beginning Year2022
    Ending Year2022
    Engine TypeL6
    Liter3.0
    CID183
    Engine Size3.0L/183
    Engine FamilyDuramax diesel inline 6-cylinder
    Drivetrain4WD
    Engine VIN CodeT
    CC2993
  • MakeGMC
    ModelSIERRA 1500 LIMITED
    SubmodelAT4
    Beginning Year2022
    Ending Year2022
    Engine TypeV8
    Liter6.2
    CID376
    CC6162
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeL
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelCUSTOM TRAIL BOSS
    Beginning Year2020
    Ending Year2021
    Engine TypeV8
    Liter6.2
    CID376
    CC6162
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeL
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelCUSTOM TRAIL BOSS
    Beginning Year2023
    Ending Year2024
    Engine TypeL4
    Liter2.7
    CID166
    CC2720
    Engine Size2.7L/166
    Engine FamilyGM 4-cylinder
    Drivetrain4WD
    Engine VIN CodeK
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelCUSTOM TRAIL BOSS
    Beginning Year2023
    Ending Year2024
    Engine TypeL6
    Liter3.0
    CID183
    CC2993
    Engine Size3.0L/183
    Engine FamilyDuramax diesel inline 6-cylinder
    Drivetrain4WD
    Engine VIN Code8
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelCUSTOM TRAIL BOSS
    Beginning Year2023
    Ending Year2024
    Engine TypeV8
    Liter5.3
    CID325
    CC5328
    Engine Size5.3L/325
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeD
  • MakeCHEVROLET
    ModelSILVERADO 1500 LTD
    SubmodelCUSTOM TRAIL BOSS
    Beginning Year2022
    Ending Year2022
    Engine TypeL4
    Liter2.7
    CID166
    CC2720
    Engine Size2.7L/166
    Engine FamilyGM 4-cylinder
    Drivetrain4WD
    Engine VIN CodeK
  • MakeCHEVROLET
    ModelSILVERADO 1500 LTD
    SubmodelCUSTOM TRAIL BOSS
    Beginning Year2022
    Ending Year2022
    Engine TypeV8
    Liter6.2
    CID376
    CC6162
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeL
  • MakeCHEVROLET
    ModelSILVERADO 1500 LTD
    SubmodelLT TRAIL BOSS
    Beginning Year2022
    Ending Year2022
    Engine TypeL6
    Liter3.0
    CID183
    CC2993
    Engine Size3.0L/183
    Engine FamilyDuramax diesel inline 6-cylinder
    Drivetrain4WD
    Engine VIN CodeT
  • MakeCHEVROLET
    ModelSILVERADO 1500 LTD
    SubmodelLT TRAIL BOSS
    Beginning Year2022
    Ending Year2022
    Engine TypeV8
    Liter5.3
    CID325
    CC5328
    Engine Size5.3L/325
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeD
  • MakeCHEVROLET
    ModelSILVERADO 1500 LTD
    SubmodelLT TRAIL BOSS
    Beginning Year2022
    Ending Year2022
    Engine TypeV8
    Liter6.2
    CID376
    CC6162
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeL
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelLT TRAIL BOSS
    Beginning Year2019
    Ending Year2022
    Engine TypeV8
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Amount of Lift Front1.750 in.
    Amount of Lift RearNone
    Front SuspensionIndependent front suspension
    Number of Lugs6
    Maximum Tire Height (in.)35 in.
    Maximum Tire Width (in.)(application)12.0 in.
    Application NotesThis kit allows for up to 295/65-20 tire on a 20x9 0 offset wheel.
    Fuel TypeGAS
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelLT TRAIL BOSS
    Beginning Year2019
    Ending Year2022
    Engine TypeV8
    Engine FamilyChevy small block Gen V
    DrivetrainRWD
    Amount of Lift Front1.750 in.
    Amount of Lift RearNone
    Front SuspensionIndependent front suspension
    Number of Lugs6
    Maximum Tire Height (in.)35 in.
    Maximum Tire Width (in.)(application)12.0 in.
    Application NotesThis kit allows for up to 295/65-20 tire on a 20x9 0 offset wheel.
    Fuel TypeGAS
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelLT TRAIL BOSS
    Beginning Year2019
    Ending Year2024
    Engine TypeV8
    Liter5.3
    CID325
    CC5328
    Engine Size5.3L/325
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeD
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelLT TRAIL BOSS
    Beginning Year2020
    Ending Year2024
    Engine TypeV8
    Liter6.2
    CID376
    CC6162
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeL
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelLT TRAIL BOSS
    Beginning Year2023
    Ending Year2024
    Engine TypeL4
    Liter2.7
    CID166
    CC2720
    Engine Size2.7L/166
    Engine FamilyGM 4-cylinder
    Drivetrain4WD
    Engine VIN CodeK
  • MakeCHEVROLET
    ModelSILVERADO 1500
    SubmodelLT TRAIL BOSS
    Beginning Year2023
    Ending Year2024
    Engine TypeL6
    Liter3.0
    CID183
    CC2993
    Engine Size3.0L/183
    Engine FamilyDuramax diesel inline 6-cylinder
    Drivetrain4WD
    Engine VIN Code8
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4
    Beginning Year2019
    Ending Year2021
    Engine TypeV8
    Liter5.3
    CID325
    CC5328
    Engine Size5.3L/325
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Engine VIN CodeD
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4
    Beginning Year2019
    Ending Year2022
    Engine TypeV8
    Engine FamilyChevy small block Gen V
    Drivetrain4WD
    Amount of Lift Front1.750 in.
    Amount of Lift RearNone
    Front SuspensionIndependent front suspension
    Number of Lugs6
    Maximum Tire Height (in.)33 in.
    Maximum Tire Width (in.)(application)11.0 in.
    Application NotesThis kit allows for up to 275/60-20 tire on a 20x9 0 offset wheel.
    Fuel TypeGAS
  • MakeGMC
    ModelSIERRA 1500
    SubmodelAT4
    Beginning Year2019
    Ending Year2022
    Engine TypeV8
    Engine FamilyChevy small block Gen V
    DrivetrainRWD
    Amount of Lift Front1.750 in.
    Amount of Lift RearNone
    Front SuspensionIndependent front suspension
    Number of Lugs6
    Maximum Tire Height (in.)33 in.
    Maximum Tire Width (in.)(application)11.0 in.
    Application NotesThis kit allows for up to 275/60-20 tire on a 20x9 0 offset wheel.
    Fuel TypeGAS

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