• Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
  • Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD - Stateside Performance - Crankshaft Dampers - Fluidampr - Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD
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FDR830151

Fluidampr

Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD

Fluidampr Steel Externally Balanced Harmonic Damper - 6.6L Duramax | 2020-2026 GMC Sierra 3500HD

$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 3500HD 6.6L Duramax and controls harmful torsional crankshaft vibration across the entire RPM range.

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

Product Overview

This viscous damper replaces the factory harmonic balancer with CNC-machined high-grade steel components and a corrosion-resistant black zinc finish with engraved timing mark.

It reduces wear on rod and main bearings, timing gear, and the crankshaft itself: critical protection for tuned or towing-heavy L5P Duramax builds.

SFI 18.1 certified, race proven for over 35 years, and requires no maintenance for the life of the engine.

Features & Specifications

  • Fits: 2020-2026 GMC Sierra 3500HD
  • Fits 6.6L Duramax diesel only
  • CNC-machined high-grade steel construction
  • Corrosion-resistant black zinc finish with engraved timing mark
  • Removable hard-coat anodized aluminum fan pulley
  • SFI 18.1 certified for competition use
  • Broad RPM range torsional vibration control
  • Externally balanced, no maintenance required
  • Made in USA

Fitment

This part fits the following vehicles:

Year Make Model Submodel
2020-2026 GMC Sierra 3500 HD AT4
2020-2021 GMC Sierra 3500 HD Base
2020-2026 GMC Sierra 3500 HD Denali
2024-2026 GMC Sierra 3500 HD Denali Ultimate
2022-2026 GMC Sierra 3500 HD Pro
2020-2026 GMC Sierra 3500 HD SLE
2020-2026 GMC Sierra 3500 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