ReadyLIFT 3.0-Inch / 1.0-Inch SST Lift Kit | Forged Torsion Keys | Front Fender Brackets | 1" Rear Block | DRW Compatible | 35" Tire Clearance | 2020–2025 Chevy Silverado / GMC Sierra 2500HD / 3500HD | SKU: 69-30300

Verified Fitment

Does NOT fit:

• Chevrolet Silverado ZR2 — explicitly excluded; different front suspension architecture
• GMC Sierra AT4X — explicitly excluded; different front suspension configuration
• 2019 and earlier GM HD 2500/3500 — different torsion bar suspension design; use predecessor ReadyLIFT kits for pre-2020 applications
• 2026 and newer GM HD 2500/3500 — confirm updated ReadyLIFT SKU for 2026 model year before ordering
• Silverado/Sierra 1500 — different suspension platform; this is an HD-only kit

DRW confirmed: This kit explicitly fits Dual Rear Wheel (dually) Silverado and Sierra 2500HD and 3500HD trucks — a meaningful distinction from many HD lift kits that confirm SRW only.

3500HD overload spring pack note: 3500HD trucks equipped with factory overload helper spring packs may require longer U-bolts than those included in the kit. Confirm your 3500HD's spring configuration before ordering — text (469) 407-7538 with your build details.

Component Specifications

⚠️ Critical torsion key indexing note: When adjusting the torsion key preload bolt, do not exceed 27 inches from the wheel center to the fender edge. Exceeding this measurement overlifts the vehicle — creating a top-off condition where the suspension has little to no down travel remaining. The result is degraded ride quality and accelerated wear on suspension components. Measure before finalizing the torsion key adjustment.

Why new torsion keys: General Motors revised the torsion bar suspension design on the 2020+ HD 2500/3500. These changes — both dimensional and geometric — made the existing ReadyLIFT torsion key kits for pre-2020 HD trucks incompatible with the new design. ReadyLIFT engineered the 69-30300 torsion keys specifically for the 2020+ torsion bar geometry. These are not shared with earlier HD ReadyLIFT kits.

Why the fender bracket: The front inner fender brackets are a new addition not present in predecessor kits. At the 35-inch tire fitment target, the factory inner fender geometry creates clearance conflict at full articulation. The new brackets resolve this without cutting or permanent body modification.

Silverado vs. Sierra fender clearance: Silverado and Sierra have different fender well opening sizes. Some minor trimming may be required depending on true tire size and design, with some variance experienced between the two models even at the same stated tire specification.

What Is and Is NOT Included

Critical Compatibility

Two absolute exclusions: ZR2 and AT4X. ReadyLIFT explicitly calls out these trims on the source doc. Both ZR2 and AT4X models use specialized front suspension components that are incompatible with this kit's torsion key and fender bracket geometry. AT4 (non-X) is confirmed compatible.

The 27-inch fender measurement is a mandatory installation control. This is not a recommended guideline — it is a hard limit. The 2020+ GM HD torsion bar suspension has a defined down-travel range. Overloading the torsion key preload beyond the point where 27 inches exists between wheel center and fender edge eliminates that down travel, converting the suspension into a rigid-spring system. The result is a truck that rides harshly and wears components at an accelerated rate. Measure during installation, not after.

3500HD overload spring pack. The 3500HD is available with a factory overload helper spring pack for maximum payload applications. The U-bolt kit included in the 69-30300 is sized for standard 2500HD and 3500HD rear leaf spring stacks. 3500HD trucks with the overload spring pack require longer U-bolts to span the full spring pack height — these are not included and must be sourced separately.

DRW tire and wheel fitment. The confirmed tire fitment specs (35" x 12.50 on 20x9 / 0 offset) apply to SRW configurations. DRW trucks have different rear axle and wheel geometry — confirm wheel and tire clearance independently for the dual rear wheel configuration before ordering tires.

Installation Notes

Skill level: Intermediate to advanced — torsion key swap, fender bracket installation, and rear block require organized work sequencing. Not a pure bolt-on: the torsion bar must be unloaded using the proper tool before key removal.

Mandatory tool — torsion key unloading tool: A torsion bar unloading tool (ReadyLIFT 66-7822B or equivalent) is required to safely unload the torsion bars before removing the factory torsion keys. This tool is not included in the kit. Do not attempt to remove torsion keys without it — torsion bars store significant energy under load and will snap back violently if released without proper equipment. Source this tool before scheduling installation.

Installation sequence — front:

1. Safely support the vehicle with the front suspension at full droop.
2. Use the torsion key unloading tool to fully relieve torsion bar preload.
3. Remove factory torsion keys.
4. Install ReadyLIFT SST forged torsion keys.
5. Set torsion key preload — do not exceed 27 inches from wheel center to fender edge.
6. Install differential drop spacers (8 pieces) at the front differential mounting locations.
7. Install front inner fender brackets (driver and passenger sides) per ReadyLIFT instructions.
8. Reinstall skid plate if equipped.

Installation sequence — rear:

1. Safely support the rear axle.
2. Remove factory U-bolts.
3. Install 1-inch rear lift blocks between the axle perch and leaf spring.
4. Install new U-bolt kit and torque to specification.

Post-installation mandatory steps:

1. Verify 27-inch fender measurement — with all four corners on the ground at ride height, measure from wheel center to fender edge at both front corners. Adjust torsion key preload if either measurement exceeds 27 inches.
2. Front-end alignment — required after any torsion key change.
3. Headlamp aim adjustment — required per ReadyLIFT installation advisory.
4. ADAS verification — check and adjust any active or passive safety system for proper aim and function.

Test fit tires before mounting. ReadyLIFT fitment recommendations are based on Wheel Pros wheels and Nitto tires. Due to manufacturer differences in tire dimensions, every combination must be test-fit before final mounting.

Common Questions

Why doesn't this fit my ZR2 or AT4X?
ZR2 and AT4X models use front suspension components — specifically the Multimatic DSSV dampers on ZR2 and the modified front end geometry on AT4X — that are incompatible with this kit's torsion key design and fender bracket geometry. ReadyLIFT explicitly excludes these trims. AT4 (non-X) is confirmed compatible.

What is the 27-inch fender measurement rule?
The 2020+ GM HD torsion bar suspension has a defined range of down travel. The torsion key preload can be set too high — a condition where the suspension runs out of down travel and becomes essentially rigid. ReadyLIFT's 27-inch limit (wheel center to fender edge) is the maximum measurement that keeps the suspension within safe operating travel. Exceeding it produces poor ride quality and rapid component wear.

Why do I need the fender brackets?
The front inner fender brackets are new to the 69-30300 (not in predecessor kits). At 35-inch tire fitment, the factory inner fender creates a clearance conflict at full articulation without the bracket. The bracket resolves this without cutting or permanent modification.

Does this kit fit my DRW (dually) HD?
Yes — the 69-30300 explicitly confirms DRW fitment, which is uncommon for HD lift kits. Confirm tire and wheel clearance for your specific DRW wheel configuration — the confirmed fitment specs apply primarily to SRW applications.

My 3500HD has the overload spring pack — do I need different U-bolts?
Yes. 3500HD trucks with factory overload helper spring packs require longer U-bolts to span the full spring stack height. The U-bolt kit included in the 69-30300 is sized for standard spring packs. Text (469) 407-7538 before ordering to confirm U-bolt requirements for your specific 3500HD.

Do I need the torsion key unloading tool?
Yes — it is mandatory for safe removal of the factory torsion keys. The tool is not included in the kit. ReadyLIFT's own tool (66-7822B) or equivalent is required. Do not attempt to remove torsion keys without it.

The Obsidian Take

The 69-30300 is ReadyLIFT's purpose-engineered response to GM's 2020 HD suspension revision — the same 3-inch forged torsion key approach that built ReadyLIFT's reputation on prior-generation HD trucks, re-engineered from the ground up for the changed torsion bar geometry on the 2020+ platform. The predecessor kits don't fit — not because they're inferior, but because GM changed the suspension design in ways that made the old torsion key geometry incompatible with the new truck.

The fender brackets are the new addition that make 35-inch tires a clean installation rather than a trimming project. At 3 inches of front lift, the tire trajectory at full compression creates a contact point with the factory inner fender. The brackets resolve this without body modification — confirming the 35" x 12.50 on a 20x9 / 0 offset as a no-trim installation.

The 27-inch fender measurement is the most important operational detail in this kit's installation. It's easy to assume that more torsion key preload means more lift and more clearance — but the GM HD torsion suspension doesn't work that way at the extreme end. Overloading the preload eliminates down travel and creates a top-off condition that degrades ride quality and wears components faster. Set the preload, measure, and verify before the truck comes off the lift.

For DRW Silverado and Sierra HD owners, the explicit DRW confirmation on this kit is meaningful. It removes the guesswork that surrounds most HD lift kit fitment on dually configurations.

This SKU is for: 2020–2025 Chevy Silverado and GMC Sierra 2500HD and 3500HD owners (SRW and DRW, 2WD and 4WD, AT4 included) targeting 3 inches of front lift and 1 inch of rear, 35-inch tire fitment, who have sourced the required torsion key unloading tool and understand the 27-inch fender measurement limit.

This SKU is NOT for: Silverado ZR2 owners (excluded), Sierra AT4X owners (excluded), 2019 and earlier GM HD owners (different torsion bar design — different kit required), 3500HD owners with overload spring packs who haven't confirmed U-bolt requirements, or anyone who does not have access to a torsion bar unloading tool.

SAE J2492 Warning
⚠ WARNING: By installing this product, you acknowledge that the suspension of this vehicle has been modified. As a result, this vehicle may handle differently than factory-equipped vehicles. As with any vehicle, extreme care must be used to prevent loss of control or rollover during sharp turns or abrupt maneuvers. Always wear seat belts, and drive safely, recognizing that reduced speeds and specialized driving techniques may be required. Failure to drive this vehicle safely may result in serious injury or death. Do not drive this vehicle unless you are familiar with its unique handling characteristics and are confident of your ability to maintain control under all driving conditions.

Manufacturer Data Disclaimer
Product specifications, fitment data, and feature details are sourced from ReadyLIFT manufacturer documentation and verified third-party technical references current at the time of publication. ReadyLIFT reserves the right to modify product specifications without notice. Confirm model year, trim (ZR2 and AT4X excluded), DRW configuration, and 3500HD spring pack status before ordering. OFAS is not responsible for incompatibility resulting from ZR2/AT4X applications, incorrect U-bolt sizing for overload spring packs, or top-off conditions resulting from exceeded torsion key preload.

Prop 65 Warning
⚠ WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.

Non-Returnable Notice
This item is non-returnable once installed. Verify trim, DRW configuration, and 3500HD spring pack status before ordering. Questions before ordering? Text (469) 407-7538.