Fox 2.5 Performance Series IFP HTO Front Shock | Single | 1.5-2.5" Lift | 2020-2025 Chevy Silverado/GMC Sierra 2500HD/3500HD | SKU 987-24-010
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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 2.5 Performance Series IFP HTO Front Shock (SKU 987-24-010) is a step-up heavy-duty front shock for the 2020–2025 Chevrolet Silverado and GMC Sierra 2500HD/3500HD, running 1.5" to 2.5" of front lift. The larger 2.5" Type II anodized aluminum body increases oil volume for superior heat dissipation and corrosion resistance versus the standard 2.0" Fox shock. Internal Floating Piston (IFP) separates shock oil from high-pressure nitrogen for optimized, consistent damping. Hydraulic Top Out (HTO) technology uses a secondary shim stack to provide position-sensitive rebound damping control, reducing harsh top-outs — particularly beneficial after installing heavier, more aggressive tires or on applications lifted higher than OEM spec. Vehicle-specific valving and larger pistons. Sold as a single front shock.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | 987-24-010 |
| Brand | Fox |
| Series | 2.5 Performance Series |
| Position | Front |
| Quantity | Single shock — order 2 for a complete front pair |
| Body | 2.5" Type II anodized aluminum |
| Damping | IFP (Internal Floating Piston) + HTO (Hydraulic Top Out) |
| HTO Function | Secondary shim stack provides position-sensitive rebound damping, reduces harsh top-outs |
| Lift Range | 1.5"–2.5" front lift |
| Application | Towing, hauling, heavier/aggressive tire setups, sustained heavy-duty use |
| Shipping Weight | 7 lbs |
| Shipping Dimensions | 26" L x 3" W x 3" H |
| Sold As | Each |
What Is and Is NOT Included
| Item | Included |
|---|---|
| 1x front shock | ✓ |
| Mounting hardware | ✓ |
| Second front shock | ✗ NOT included — order quantity 2 for a pair |
| Rear shocks | ✗ NOT included — sold separately (e.g., 987-24-011 for matching 1.5-2.5" rear) |
Fox 2.5 HTO Front Shock Family — Confirm Your Platform Generation and Lift Range
| SKU | Years | Lift Range |
|---|---|---|
| 987-24-032 | 2011–2019 | 4–6" |
| 987-24-008 | 2020–2025 | 0–1" |
| 987-24-010 (this listing) | 2020–2025 | 1.5–2.5" |
| 987-24-033 | 2020–2025 | 4–6" |
| 987-24-024 | 2020–2026 | 5–6.5" |
These are not interchangeable across platform generations or lift ranges — confirm your exact model year and lift height before ordering.
Verified Fitment
| Vehicle | Years | Lift Range | Status |
|---|---|---|---|
| Chevrolet Silverado 2500HD | 2020–2025 | 1.5"–2.5" | ✓ |
| Chevrolet Silverado 3500HD | 2020–2025 | 1.5"–2.5" | ✓ |
| GMC Sierra 2500HD | 2020–2025 | 1.5"–2.5" | ✓ |
| GMC Sierra 3500HD | 2020–2025 | 1.5"–2.5" | ✓ |
| Silverado/Sierra 2500HD/3500HD | 2011–2019 | Any | ✗ Different front suspension generation — order 987-24-032 for 4-6" lift on that platform |
| Silverado/Sierra 2500HD/3500HD | 2020–2025 | 0–1" | ✗ Wrong lift range for this SKU — order 987-24-008 |
| Silverado/Sierra 1500 | Any | Any | ✗ Different platform |
Critical Compatibility
| Configuration | Notes |
|---|---|
| 2011–2019 Silverado/Sierra HD | Does not fit — different front suspension generation, requires 987-24-032 |
| Stock height to 1" front lift on 2020-2025 trucks | Wrong lift range for this SKU — order 987-24-008 instead |
| Front lift exceeding 2.5" | Requires a different Fox 2.5 HTO part number — e.g., 987-24-033 for 4-6" |
| Long-travel or coilover conversion suspension | Not compatible |
| Mismatched left/right shocks | Replace in pairs for handling balance |
Common Questions
Does this fit my 2018 Silverado 2500HD?
No. This part number is for the 2020-2025 chassis specifically. A 2011-2019 truck needs a different Fox HTO part number (987-24-032) for its different front suspension generation.
What if my truck is stock height or close to it?
This shock is valved for 1.5"-2.5" of lift, not stock height. For 0-1" lift on the 2020-2025 chassis, order 987-24-008 instead.
What's the real difference between this and the standard Fox 2.0?
The larger 2.5" body holds more oil and nitrogen, improving heat dissipation under sustained heavy use. The HTO technology adds position-sensitive top-out control that the standard 2.0 doesn't have.
Do I need one or two?
This listing is for a single shock. Order quantity 2 for a complete front pair, and replace both sides together for handling balance.
The Obsidian Take
The 987-24-010 is for the 2020-2025 Silverado/Sierra 2500HD/3500HD owner running 1.5"-2.5" of front lift who tows or hauls frequently, or runs heavier/more aggressive tires, and wants the larger 2.5" body and Hydraulic Top Out control over the standard Fox 2.0 shock.
Two checks matter most before ordering. First, confirm your truck is 2020 or newer — the 2011-2019 generation needs a completely different part number. Second, confirm your actual lift height falls in the 1.5"-2.5" range; stock-height trucks need 987-24-008 instead.
Non-Returnable Notice: Once installed, this unit is non-returnable. Confirm model year and front 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 and authorized distributor documentation. Obsidian Forged Auto Supply is an authorized Fox dealer. Manufacturer specifications are subject to change without notice.