FOX Performance Series 2.0 IFP Front Shock — Chevrolet Silverado & GMC Sierra 2500/3500 SKU: 985-24-189HD
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Shipping & Delivery
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Fitment, Shipping & Product Support
Overview
This is a FOX Performance Series 2.0 IFP smooth-body front shock for the 2011–2019 Chevrolet Silverado 2500 HD/3500 HD and GMC Sierra 2500 HD/3500 HD — a monotube design using an Internal Floating Piston (IFP) to separate shock oil from a nitrogen-charged gas chamber, race-developed valving, and a one-piece 2.0" clear-anodized aluminum body, rated for a 1.5"–3.5" front lift.
Before ordering: This is a front-position shock only — it does not include a rear shock. It fits the 2011–2019 Chevrolet Silverado 2500 HD/3500 HD and GMC Sierra 2500 HD/3500 HD, rated for a 1.5"–3.5" front lift range. Confirm your target lift height falls within this range before ordering.
Required separately: Manufacturer-specified installation hardware, tools, and a professional installation are recommended; this listing does not include installation instructions or hardware beyond the shock itself. Confirm whether a matching rear shock is needed for your build — it is not included with this SKU.
Verified Fitment
| Make | Model | Years | Position | Lift Height |
|---|---|---|---|---|
| Chevrolet | Silverado 2500 HD | 2011–2019 | Front | 1.5"–3.5" |
| Chevrolet | Silverado 3500 HD | 2011–2019 | Front | 1.5"–3.5" |
| GMC | Sierra 2500 HD | 2011–2019 | Front | 1.5"–3.5" |
| GMC | Sierra 3500 HD | 2011–2019 | Front | 1.5"–3.5" |
All listed applications are All drivetrain, All fuel type, All body/door configurations.
Component Specifications
| Attribute | Specification |
|---|---|
| Brand | FOX Factory |
| Part number | 985-24-189 |
| Series | Performance |
| Design | 2.0 IFP (Internal Floating Piston), monotube, nitrogen-charged gas chamber |
| Position | Front |
| Travel | 6.61" |
| Extended length | 20.39" |
| Compressed length | 13.78" |
| Body | 2.0", impact-extruded and CNC-machined 6061-T6 aluminum, one-piece |
| Body plating | Clear-anodized |
| Components | Black-anodized, CNC-machined 6061-T6 billet aluminum |
| Shaft | 5/8" hard chrome plated, heat-treated alloy steel |
| Piston | Race-developed high-flow piston design |
| Valving | Application-specific |
| Seals | Redundant sealing pack — main seal, wiper seal, scraper seal |
| Top mount | Bar pin |
| Bottom mount | C1 |
| Warranty | FOX Limited Lifetime Warranty on 2.0/2.5 Performance Series (for units purchased after 3/30/2025); see full terms below |
What Is and Is NOT Included
Included:
- One FOX Performance Series 2.0 IFP front shock, part number 985-24-189
Not included:
- Rear shock (not part of this SKU; confirm separately if needed for your build)
- Installation hardware and tools
- Professional installation or alignment services
Critical Compatibility
- Front position only: This SKU is a front shock. It does not include or substitute for a rear shock.
- Lift height: Rated for a 1.5"–3.5" front lift. Confirm your target ride height falls within this range before ordering.
- Mount types: Uses a bar pin top mount and a C1 bottom mount — confirm these match your vehicle's mounting hardware, as they differ from the eyelet-style mounts used on other FOX Performance Series shocks in this catalog.
- Coverage is uniform across all four model lines: 2011–2019, all drivetrains, all fuel types, all body/door configurations, for both the Chevrolet Silverado 2500 HD/3500 HD and GMC Sierra 2500 HD/3500 HD — no model-year gaps or trim-specific exceptions within this range.
Installation Notes
No manufacturer installation instructions were supplied for this task. Professional installation is recommended for suspension components. Follow current FOX installation documentation for this exact part number, including torque specifications and any required hardware, before installation.
The Obsidian Take
This FOX 985-24-189 Performance Series 2.0 IFP shock is a front-position shock for the 2011–2019 Chevrolet Silverado 2500 HD/3500 HD and GMC Sierra 2500 HD/3500 HD, rated for a 1.5"–3.5" front lift. Fitment is uniform across all four model lines and the full model-year range — the main things to confirm before ordering are your target lift height and that your mounting hardware matches the bar pin/C1 mount configuration.
This Product Is For You If
- You own a 2011–2019 Chevrolet Silverado 2500 HD/3500 HD or GMC Sierra 2500 HD/3500 HD.
- Your target front lift falls within the 1.5"–3.5" range.
- You are replacing or upgrading the front shock specifically, not the rear.
This Product Is Not For You If
- You need a rear shock — this SKU is front position only.
- Your target lift height falls outside the 1.5"–3.5" range.
- Your vehicle's mounting hardware does not match the bar pin (top) / C1 (bottom) mount configuration.
Common Questions
Is this a front or rear shock?
Front only. It does not include or substitute for a rear shock.
Does this fit both Chevrolet and GMC trucks?
Yes — verified for the Chevrolet Silverado 2500 HD/3500 HD and GMC Sierra 2500 HD/3500 HD, 2011–2019, uniformly.
What lift height is this shock rated for?
1.5" to 3.5" of front lift.
What mounts does this shock use?
A bar pin top mount and a C1 bottom mount.
What is the warranty?
FOX provides a Limited Lifetime Warranty on 2.0/2.5 Performance Series shocks purchased after 3/30/2025 (excluding sports car shocks and 2.0 Performance Series remote-reservoir shocks). See full warranty terms below.
Manufacturer Data Disclaimer
Fitment and specification data for this product are sourced from FOX Factory manufacturer fitment data and product documentation supplied for this exact part number, current as of publication. Specifications and fitment are subject to change without notice; confirm current documentation for this SKU at the time of purchase.
Required Legal, Warning, Fitment, and Return Notices
Warranty Summary: FOX Factory, Inc. warrants, to the original retail owner of each new FOX 2.0/2.5 Performance Series suspension product purchased after 3/30/2025 (excluding sports car shocks and 2.0 Performance Series remote-reservoir shocks), that the product is free from defects in materials and workmanship under normal use on the vehicle application it was designed for. This warranty covers factory defects in material and workmanship other than finish and coatings. For products not meeting the post-3/30/2025 purchase condition, FOX's standard Limited One (1) Year Warranty on suspension products applies instead, running from the date of original retail purchase from an authorized FOX dealer.
This warranty is conditioned on normal operation and proper maintenance as specified by FOX; is non-transferable and applies only to the original retail owner; and is void if the product is subjected to abuse, neglect, unauthorized repair or service, alteration, modification, accident, or other abnormal or improper use. FOX is not liable for removal, installation, or reinstallation costs, including labor. If FOX determines a product is covered, it will be repaired or replaced with a comparable model at FOX's sole discretion — this is the exclusive remedy, and incidental, consequential, or punitive damages are excluded. Normal wear and tear, and failures from abuse, improper assembly, neglect, alteration, improper maintenance, crash, misuse, or collision are not covered. This warranty gives specific legal rights, which may vary by state or country.