• Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD
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FDR830151

Fluidampr

Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD

Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 2500HD

$698.80 USD
$698.80 USD
Sale Sold out
Shipping calculated at checkout.

The Fluidampr Steel Externally Balanced Damper fits the 2020-2026 GMC Sierra 2500HD with the 6.6L Duramax and controls harmful torsional vibration across the entire RPM range.

Install Difficulty: Professional Install Only
Crankshaft damper replacement requires a harmonic balancer puller, installer tool, and front cover access; typically takes 2-3 hours with proper torque-to-yield bolt procedure.

Product Overview

This viscous damper replaces the factory unit with CNC-machined high-grade steel components and a black zinc corrosion-resistant finish. The design reduces wear on the crankshaft, bearings, and timing gear while unleashing lost torque and horsepower.

SFI 18.1 certified and race proven for over 35 years, it is the technology preferred by heavy duty diesel OEMs and leading performance diesel engine builders. No maintenance required.

Features & Specifications

  • Fits: 2020-2026 GMC Sierra 2500HD
  • Fits 6.6L Duramax diesel only
  • SFI 18.1 certified
  • CNC-machined high-grade steel construction
  • Black zinc corrosion-resistant finish with engraved timing mark
  • Removable hard coat anodized aluminum fan pulley
  • Externally balanced viscous damper design
  • Broad RPM range vibration protection
  • No maintenance required
  • Made in USA

Fitment

This part fits the following vehicles:

Year Make Model Submodel
2020-2026 GMC Sierra 2500 HD AT4
2024-2026 GMC Sierra 2500 HD AT4X
2020-2021 GMC Sierra 2500 HD Base
2020-2026 GMC Sierra 2500 HD Denali
2024-2026 GMC Sierra 2500 HD Denali Ultimate
2022-2026 GMC Sierra 2500 HD Pro
2020-2026 GMC Sierra 2500 HD SLE
2020-2026 GMC Sierra 2500 HD SLT
⚠ Submodel Fitment: If your submodel is not listed in the fitment table above, we cannot confirm fitment. Please contact us before purchasing to verify.

Shipping & Returns

Tracking is typically provided within 3–5 business days; items shipping direct from the manufacturer may take 5–7. Some items are made to order or may be backordered. Questions about stock? Reach us through live chat or email.

Warranty

All warranties are through the manufacturer and are facilitated by Stateside Performance. Some manufacturers require the end user to contact them directly; in that case we will point you to the right contact. Email us with any warranty questions.

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  • Free shipping over $250

    Free shipping applies to items that are shipped via ground through UPS or FedEx and are over $250 going to the continental 48 states. This does not apply to Alaska or Hawaii, and does not apply to any item(s) that are shipped via freight or with any other option other than ground shipping.

    Shipping policy 

  • 30-day returns

    Returns must be requested within 30 days of delivery. Parts must be new, unused, uninstalled, and in original packaging, with an RMA. Some items are final sale.

    Return policy