Fox 2.0 Performance Series Rear Shock | Single | 0-2.5" Lift | 1999-2019 Chevy Silverado/GMC Sierra 2500HD/3500HD | SKU 980-24-664
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Before ordering, verify your vehicle details, current setup, and SKU with OFAS fitment support so your upgrade matches your build.
Shipping & Delivery
Free shipping is available within the lower 48 U.S. states. Large or heavy items may ship by freight, and delivery timing can vary by warehouse, carrier, and product availability.
Fitment, Shipping & Product Support
The Fox 2.0 Performance Series Rear Shock (SKU 980-24-664) is engineered for the 1999–2019 Chevrolet Silverado and GMC Sierra HD platform — covering Silverado/Sierra 2500, 2500HD, 3500, 3500HD, and 1500 HD/1500 HD Classic — running stock height or up to 2.5" of rear lift. Aluminum body construction improves heat dissipation over steel-bodied OEM shocks and resists rust. The IFP (Internal Floating Piston) mono-tube design separates oil and nitrogen gas, eliminating oil aeration to maintain consistent damping performance through heat cycles during towing, hauling, and rough-road use. Race-developed high-flow damping piston with application-specific valving tuned to this chassis generation. Sold as a single rear shock.
This part covers the pre-2020 GM HD chassis only. The 2020+ redesigned Silverado/Sierra 2500HD/3500HD requires a different Fox part number.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | 980-24-664 |
| Brand | Fox |
| Series | 2.0 Performance Series |
| Position | Rear |
| Quantity | Single shock — order 2 for a complete rear pair |
| Body | Aluminum — improved heat dissipation vs. OEM steel body, rust resistant |
| Damping | IFP (Internal Floating Piston) mono-tube — separates oil from nitrogen gas |
| Piston | Race-developed high-flow damping piston, application-specific valving |
| Lift Range | 0–2.5" rear lift |
| Application | Towing, hauling, daily driving, rough-road use |
| Sold As | Each |
What Is and Is NOT Included
| Item | Included |
|---|---|
| 1x rear shock | ✓ |
| Mounting hardware | ✓ |
| Second rear shock | ✗ NOT included — order quantity 2 for a pair |
| Front shocks | ✗ NOT included — sold separately under a different part number |
Verified Fitment — Per Fox's Own Master Fitment Data
| Vehicle | Years | Lift Range | Status |
|---|---|---|---|
| Chevrolet Silverado 2500 | 1999–2004 | 0–2.5" | ✓ |
| Chevrolet Silverado 2500 HD | 2001–2019 | 0–2.5" | ✓ |
| Chevrolet Silverado 3500 | 2001–2006 | 0–2.5" | ✓ |
| Chevrolet Silverado 3500 HD | 2007–2019 | 0–2.5" | ✓ |
| Chevrolet Silverado 1500 HD | 2001–2003, 2005–2006 | 0–2.5" | ✓ |
| Chevrolet Silverado 1500 HD Classic | 2007 | 0–2.5" | ✓ |
| GMC Sierra 2500 | 1999–2004 | 0–2.5" | ✓ |
| GMC Sierra 2500 HD | 2001–2019 | 0–2.5" | ✓ |
| GMC Sierra 3500 | 2001–2006 | 0–2.5" | ✓ |
| GMC Sierra 3500 HD | 2007–2019 | 0–2.5" | ✓ |
| GMC Sierra 1500 HD | 2001–2003, 2005–2006 | 0–2.5" | ✓ |
| GMC Sierra 1500 HD Classic / 2500 HD Classic | 2007 | 0–2.5" | ✓ |
| Chevrolet Avalanche 2500 | 2002–2006 | 0–3" | ✓ |
| Chevrolet Suburban 2500 | 2000–2013 | 0–3" | ✓ |
| GMC Yukon XL 2500 | 2000–2013 | 0–1" | ✓ |
| Hummer H2 | 2003–2009 | 0–1" | ✓ |
| Silverado/Sierra 2500HD/3500HD | 2020–2026 | Any | ✗ Redesigned chassis — requires a different Fox part number |
| Silverado/Sierra 1500 | Any | Any | ✗ Different rear suspension geometry |
Critical Compatibility
| Configuration | Notes |
|---|---|
| 2020+ Silverado/Sierra 2500HD/3500HD | Does not fit — the redesigned chassis uses a different Fox rear shock part number |
| Rear lift exceeding 2.5" | Requires a longer-travel Fox shock — confirm the correct part number for your lift height before ordering |
| Long-travel or coilover conversion suspension | Not compatible |
| Mismatched left/right shocks | Replace in pairs for handling balance — mismatched damping rates between sides causes instability under load |
| Lift height by vehicle | Lift range varies by specific model (2.5" for 2500HD/3500HD pickups, 3" for Avalanche/Suburban, 1" for Yukon XL/H2) — confirm your exact vehicle's rated lift range above |
Common Questions
Does this fit my 2021 Sierra 2500HD?
No. The 2020+ Silverado/Sierra 2500HD/3500HD uses a redesigned chassis and requires a different Fox part number. This shock is for the 1999–2019 generation.
What's the actual lift range — 1" or 2.5"?
For the Silverado/Sierra 2500/2500HD/3500/3500HD pickup applications, Fox's own fitment data confirms 0–2.5" of rear lift. Some retailers market this part under a "0-1" lift" label, but the manufacturer's fitment range extends to 2.5" for these specific models. Other vehicles sharing this part number (Yukon XL, Hummer H2) are rated to a narrower 0–1" range — confirm your specific vehicle above.
Does this fit a Suburban or Avalanche?
Yes — the Suburban 2500 (2000–2013) and Avalanche 2500 (2002–2006) are confirmed in Fox's own fitment data at a 0–3" rear lift range.
Do I need one or two?
This listing is for a single shock. Order quantity 2 for a complete rear pair, and replace both sides together for balanced handling.
The Obsidian Take
The 980-24-664 is for the 1999–2019 GM HD truck owner — Silverado or Sierra 2500/2500HD/3500/3500HD, and several related GM platforms sharing the same chassis — running stock height or up to 2.5" of rear lift who wants Fox's IFP damping and aluminum-body heat dissipation over the factory steel shock.
The check that matters most: confirm your truck is pre-2020. The redesigned current-generation 2500HD/3500HD uses an entirely different Fox part number, and this one will not fit that chassis regardless of how the lift height lines up.
Non-Returnable Notice: Once installed, this unit is non-returnable. Confirm model year, vehicle, and rear lift height before ordering.
⚠️ California Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information visit P65Warnings.ca.gov.
Specifications sourced from Fox's own master fitment documentation. Obsidian Forged Auto Supply is an authorized Fox dealer. Manufacturer specifications are subject to change without notice.