Home / Shop / ReadyLift Suspension Lift Kits 42-30640 Kit, 6.00 in. Lift, Steering Knuckle, Leaf Spring Block, Falcon 2.1 Shocks, GMC, Chevy, Kit

ReadyLift Suspension Lift Kits 42-30640 Kit, 6.00 in. Lift, Steering Knuckle, Leaf Spring Block, Falcon 2.1 Shocks, GMC, Chevy, Kit

SKU: RLS42-30640

Suspension Leveling & Lift Kits

Readylift Suspension

ReadyLift Suspension Lift Kits 42-30640 Kit, 6.00 in. Lift, Steering Knuckle, Leaf Spring Block, Falcon 2.1 Shocks, GMC, Chevy, Kit

SKU: RLS42-30640

Suspension Leveling & Lift Kits

Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

We accept

Description

IMPORTANT NOTICE: Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

ReadyLift Suspension lift kits provide front and rear lift solutions to boost your vehicle's stance. They offer a huge selection of kits to give your truck, Jeep, or SUV just the right posture and attitude you are looking for. ReadyLift SST (Smart Suspension Technology) lift kits are the original mid-lift solutions for those who want more than what a leveling kit offers, but less overall height than that of a big lift. And for those of you wanting that BIG lift, they have complete kits that provide maximum lift and aggressive style. So whether you want a little or a lot, "Just don't lift it … ReadyLift it!"

Part Type

Suspension Leveling & Lift Kits

Data: v4.2 - Upd: 2026-09-29 18:23:53

Specifications

Product Attributes - Brand: ReadyLift Suspension
Product Attributes - Manufacturer's Part Number: 42-30640
Product Attributes - Part Type: Suspension Leveling & Lift Kits
Product Attributes - Product Line: ReadyLift Suspension Lift Kits
Product Attributes - UPC: 194933366446
Product Attributes - Lift Style: Suspension Lift Kit
Product Attributes - Primary Front Lift Component: Steering knuckle
Product Attributes - Primary Rear Lift Component: Leaf spring block
Product Attributes - Front Shocks/Struts Included: Yes
Product Attributes - Front Shock Quantity Per Wheel: 1
Product Attributes - Front Shock Type: Single adjustable
Product Attributes - Rear Shocks/Struts Included: No
Product Attributes - Rear Shock Quantity Per Wheel: 1
Product Attributes - Rear Shock Type: Gas-charged monotube
Product Attributes - Brake Lines Included: No
Product Attributes - Hardware Included: Yes
Product Attributes - FMVSS 126 Certification: No
Product Attributes - Quantity: Sold as a kit.
Product Attributes - Notes: Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Reference Information

Brand Name/s	Readylift Suspension
StreetFX SKU	rls42-30640
SFX Item ID	5008946
Supplier Item Code	5008946
Manufacturer SKU	42-30640
Manufacturer UPC	194933366446

Compatibility

Application Data

Make	GMC
Model	SIERRA 3500 HD
Submodel	PRO
Beginning Year	2022
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	PRO
Beginning Year	2022
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	PRO
Beginning Year	2022
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLE
Beginning Year	2022
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLE
Beginning Year	2022
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLE
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLE
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLT
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLT
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLT
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	SLT
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 2500 HD
Submodel	SLT
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 2500 HD
Submodel	SLT
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	AT4
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	AT4
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	BASE
Beginning Year	2024
Ending Year	2021
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	BASE
Beginning Year	2024
Ending Year	2021
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	BASE
Beginning Year	2020
Ending Year	2021
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	BASE
Beginning Year	2020
Ending Year	2021
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	DENALI
Beginning Year	2020
Ending Year	2021
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	DENALI
Beginning Year	2020
Ending Year	2021
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	DENALI
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	DENALI
Beginning Year	2020
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	DENALI ULTIMATE
Beginning Year	2024
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/403
Engine Family	DURAMAX V8 DIESEL
Drivetrain	4WD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Make	GMC
Model	SIERRA 3500 HD
Submodel	PRO
Beginning Year	2022
Ending Year	2024
Engine Type	V8
Engine Size	6.6L/401
Engine Family	Chevy small block Gen V
Drivetrain	RWD
Amount of Lift Front	6.000 in.
Amount of Lift Rear	6.000 in.
Maximum Tire Height (in.)	37 in.
Maximum Tire Width (in.)(application)	12.5 in.
Recommended Wheel Width (in.)	9.00 in.
Application Notes	Will not fit single cab models. Some HD model trucks with the factory tow package installed may require longer U-bolts.

Loading compatibility information...

Keep shopping

Select Your Vehicle

ReadyLift Suspension Lift Kits 42-30640 Kit, 6.00 in. Lift, Steering Knuckle, Leaf Spring Block, Falcon 2.1 Shocks, GMC, Chevy, Kit

ReadyLift Suspension Lift Kits 42-30640 Kit, 6.00 in. Lift, Steering Knuckle, Leaf Spring Block, Falcon 2.1 Shocks, GMC, Chevy, Kit

Description

Part Type

Specifications

Reference Information

Compatibility

More from Readylift Suspension

ReadyLift Suspension Leveling Kits 66-19150 & Lift Kits, Kit, Front Strut Extensions, 1.50 in. Lift Front, Ram, Kit

ReadyLift Suspension Lift Kits 44-30820 Kit, 8.00 in., Front Knuckles, Crossmember, Torsion Bar Brackets, CV Spacers, Differential Drop Brackets, Shocks, Chevy, GMC, Kit

ReadyLift Suspension SST Lift Kits for 2021-2025 F-150 - 69-21350 Kit, Lift, 3.5 in. Front/ 1.25 in. Rear, Ford, Kit

ReadyLift Suspension Lift Kits 42-30840 Kit, 8.0 in., Steering Knuckle, Leaf Spring Block, Falcon 3.3 Shocks, GMC, Chevy, Kit

ReadyLift Suspension Leveling Kits for 2023-2025 SEQUOIA, 2022-2024 TUNDRA - 66-52201 Lift, Kit, 2 in. Front Spacers, with Differential Drop Brackets, Toyota, Kit

ReadyLift Suspension Ball Joints 67-3412 Joint, Greasable, Upper, 4.00 in. Lift, Chevrolet, GMC, Each