
Questions about fitment?
Talk to a TRU specialist
We’ll help you verify fitment before you buy.
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Important notes before you order
- APPLICATION NOTE #3: Will not fit Cab & Chassis models
- APPLICATION NOTE #11: Chevrolet Silverado 2500 ZR2 and GMC Sierra 2500 AT4X will have front lift height range of .5-2" over stock
- APPLICATION NOTE #12: Helper air bags are recommended for hauling/towing heavy loads
- APPLICATION NOTE #13: Included rear shocks are compatible with 0-2" of rear lift over stock
- APPLICATION NOTE #55: Shocks Are Fully Serviceable. Lift Heights Indicated Are For A Stock Equipped Vehicle.
- APPLICATION NOTE #151: Fits single rear wheel models only
- APPLICATION NOTE #152: ICON Delta Joint Pro upper control arms required
- APPLICATION NOTE #155: Requires recalibration of Advanced Driver Assistance Systems (ADAS) after install
- APPLICATION NOTE #302: GM 2500 HD models equipped with Max Trailering Package and GM 3500 HD require removal of top overload leaf
TRU specialist notes
From the Trucks R Us fitment and install team, beyond the manufacturer's information.
- Plan for a professional wheel alignment after installing any lift or leveling kit.
- Going to bigger tires as well? Speedometer recalibration may be needed, and some tire and wheel combinations need trimming. Check the recommended wheels and tires, or ask us before you order.
Specifications
| Brand | ICON Vehicle Dynamics |
|---|---|
| Part number | K78372L |
| UPC / GTIN | 840103436500 |
| Active or Passive Suspension | Passive |
| Adjustable Compression | Yes |
| Adjustable Control Arm | Yes |
| Adjustable Damping | Yes |
| Adjustable Rebound | No |
| Bushing(s) Included | Yes |
| Damping Adjustment Type | Dual Speed Manual |
| Front Reservoir Style | Remote |
| Front Shock Body Diameter | 3 IN |
| Grade Type | Performance |
| Leaf Spring Color | Black |
| Leaf Spring Leaf Quantity | 6 |
| Leaf Spring Material | Steel |
| Maximum Lift | 3.5 IN |
| Maximum Lift Front | 3.5 IN |
| Maximum Lift Height Front | 3.5 IN |
| Maximum Lift Height Rear | 0 IN |
| Maximum Lift Rear | 0 IN |
| Minimum Lift Front | .5 IN |
| Mounting Hardware Included | Yes |
| Rear Reservoir Style | Remote |
| Rear Shock Body Diameter | 3 IN |
| Rear Spring Rate Type | Linear |
| Shocks Included | Yes |
| Spring Color | Black |
| Spring Material | Steel |
| Country of Origin | US |
| Installation Instructions | I71704XP/REVA.pdf |
California Proposition 65 warning applies to this product. www.P65Warnings.ca.gov
What's in the box
| Qty | Part | Description |
|---|---|---|
| 1 | 71704XP | 20-26 GM 2500/3500 HD 0-3.5" FRONT VS 3.0 RR CDXS PAIR |
| 1 | 78586DJ | 20-26 GM 2500/3500 HD BILLET UCA DJ PRO HD KIT |
| 1 | 71705XP | 11-26 GM 2500/3500 HD 0-2" REAR VS 3.0 RR CDXS PAIR |
| 1 | 73033 | 20-26 GM 2500/3500 HD TORSION KEY KIT |
| 2 | 178527 | 2011-2026 GM 2500 HD/3500 HD SRW REAR LEAF PACK |
Features
- Adjustable for 2-3.5” of front lift height over stock
- Vehicle specific tuned 3.0 Series remote reservoir front and rear shocks for the ultimate in shock damping and control
- All shock absorbers equipped with ICON CDXS for independent adjustability of high speed and low speed compression force for handling response and aggressiveness
- Improved ride quality and suspension performance over stock
- Billet aluminum Delta Joint Pro HD UCAs allow for additional caster/camber adjustment
- Forged steel torsion keys
- Front wheel travel increase of approximately 3" over stock
- Rear leaf springs lower spring rate and increase distance to overload engagement compared to stock to greatly improve rear ride quality
- Leaf springs maintain stock rear ride height for a level stance with the front
- 6061 Aircraft grade aluminum CNC machined components
- Corrosion resistant hard anodized aluminum shock bodies
- 100% Bolt-on system - no drilling, cutting, or welding necessary for install
Recommended wheels & tires
- OEM Wheels & Tires Fitment: Yes
- Recommended Aftermarket Wheels: ICON Alloys - 18x9" w/ 5.5" Backspace / 12mm Offset
- Recommended Aftermarket Wheels: ICON Alloys - 20x9" w/ 5.5" Backspace / 12mm Offset
- Recommended Aftermarket Tires: 35" x 12.50" (Larger tires may fit but fender trimming and modifications will be required.)
Installation
Free install support from the Trucks R Us tech team, for you or your shop.
Overview
Tougher, stronger and more capable - That's the motto that General Motors used when debuting the all-new fleet of heavy-duty trucks in 2020. ICON Vehicle Dynamics stayed true to GM engineers' thought process with the development of our suspension systems for the 2020-2026 Chevrolet Silverado 2500 HD/3500 HD and GMC Sierra 2500 HD/3500 HD trucks. Using ICON's holistic engineering philosophy, our R&D team went above and beyond to develop several stages of complete suspension systems that provide varying levels of adjustability, capability, and overall vehicle performance. ICON's Stage 2 3.0 system is comprised of CDXS equipped V.S. 3.0 Series remote reservoir front and rear shocks, billet aluminum Delta Joint Pro HD upper control arms, rear leaf spring packs, and torsion keys that allow for 2-3.5” of front lift height adjustment. The ICON vehicle specific tuned 3.0 Series shocks with CDXS are the key to attaining optimum ride quality and getting that desired comfort with the 3/4 & 1-ton working capability with their larger diameter, piston area, internal bump zones, and oil volume working to control rough terrain better than smaller diameter shocks. Remote reservoirs also greatly increase shock oil volume and heat dissipation surface area to resist overheating and cavitation under hard use, which can lead to damper fade. The included Compression Damping Dual Speed valves (CDXS) control fluid flow under compression, with independent adjustability of high speed and low speed compression force. 10 discreet detented settings for both low and high-speed adjustment knobs allow separate adjustments for handling response and overall aggressiveness.
The included ICON billet aluminum upper control arm kit is designed to improve overall performance with corrected front-end geometry, increased on-vehicle camber and caster adjustment, improved suspension component clearance, and when paired with the extended travel front shocks, increases wheel travel over the OEM configuration to maximize suspension performance. Additionally, replacing the OE ball joint with the serviceable and rebuildable ICON Delta Joint Pro HD allows for full bump and droop travel of the front suspension while eliminating bind. The included torsion keys install onto the factory torsion bars and allow for 2-3.5” of front lift height adjustment to allow for a level stance and larger, more aggressive wheel and tire fitment. ICON rear leaf packs provide improved ride quality while maintaining factory rear ride height. These full replacement leaf back lowers the rear spring rate approximately 20% compared to stock as well as shifts the overload transition point higher in the suspension travel to improve small bump compliance. While driving the construction site or trails to your favorite dirt bike location, ICON wants you to get there in comfort, just like your drive to work.
Questions
Will this fit my truck?
Select your truck at the top of the page and the fit check will confirm it. If your exact trim is not listed, call 866-235-4715 or live chat and a fitment specialist will check it before you order.
Do you help with installation?
Yes. Our technical team helps you or your shop with installation and troubleshooting after delivery, on top of the manufacturer’s support.
What if the part has a problem?
We work the warranty claim with the manufacturer on your behalf, within the manufacturer’s warranty policy.
Can I return it?
Most items can be returned within 30 days. See our return policy for details.
Do I need an alignment after installing?
Yes. Any lift or leveling kit changes suspension geometry, so get a professional alignment after installation.
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