A Comprehensive Guide to 2007-2013 Chevrolet Avalanche Engine Mounts
Feeling a vibration or hearing a clunk in your Avalanche? Your engine mounts may be the cause.
- The driver-side hydraulic engine mount is a very common failure point on these trucks.
- Consider upgrading to the more durable solid rubber Hummer H2 mount (GM Part #25847739) for a long-term fix.
- Always replace engine mounts in pairs to ensure proper alignment and prevent premature wear on the new part.
- Budget-friendly brands like Anchor or DEA may save money initially but often have a shorter lifespan and may increase vibration.
Symptoms of a Failing Engine Mount
When an engine mount fails on your Avalanche, the signs are usually noticeable. The original mounts, especially the driver's side, are known to be a common failure point on these trucks. Look out for these symptoms:
- Excessive Vibration: You may feel a strong vibration through the steering wheel, floor, or seats, especially when the truck is idling at a stoplight or in gear.
- Clunking or Banging Noises: Loud clunks or thumps from the engine bay are common, particularly when you accelerate, put the truck in gear, or shut off the engine. This is the sound of the engine moving and hitting other parts.
- Visible Engine Movement: Have a helper stand to the side of the truck. With the hood open and the parking brake set, put the truck in drive and briefly press the accelerator while holding the brake. If you see the engine lift or rock excessively, a mount has likely failed. 🎬 Watch: How to locate and diagnose a bad engine mount
- Leaking Fluid: The original GM mounts are often fluid-filled (hydraulic). If you see dark, greasy fluid on the mount or the frame below it, the mount has failed and needs replacement.
Pro Tip: The Hummer H2 Mount Upgrade
The original fluid-filled driver-side mount on the GMT900 platform (which includes your Avalanche) is a known weak point. Many owners and mechanics choose to replace it with a solid rubber engine mount designed for the Hummer H2 Alpha (GM Part #25847739). This is a direct, bolt-in upgrade that is more durable and eliminates the original failure-prone hydraulic design. It often makes installation easier due to a smaller heat shield.
Choosing the Right Aftermarket Engine Mount
When shopping for a new engine mount, you'll find different brands at different price points. Quality can vary significantly.
Tier 1: OE-Style and Upgraded Replacements
ACDelco: As General Motors' parts brand, ACDelco offers the original equipment (OE) replacement. If you want to maintain the truck's original feel, this is a direct replacement. However, be aware that the original hydraulic design for the driver's side is prone to failure. Consider the solid H2 mount (also a GM part) as a more durable alternative.
Tier 2: Economy Aftermarket Brands
Anchor, DEA, Westar, Pioneer, Skyward: These brands offer more affordable options and are widely available. While they are designed to fit your vehicle, they are considered budget-friendly choices. Forum discussions and reviews from mechanics suggest these mounts may not last as long or absorb vibrations as effectively as OE-style parts. They can be a good choice if the budget is tight, but be aware you may be replacing them again sooner.
🎬 See common symptoms and a breakdown of replacement costs| Part Type | Estimated Cost (Part Only) |
|---|---|
| New OEM (Dealer) | $228 - $273 |
| New Aftermarket (OE-Style/Upgraded) | $90 - $205 |
| New Aftermarket (Economy) | $45 - $90 |
| Shop Labor (Professional Installation) | $305 - $448 |
Frequently Asked Questions (FAQ)
How many engine mounts does my 2007-2013 Avalanche have?
Your Avalanche has two main engine mounts (one on the driver's side, one on the passenger's side) and one transmission mount, which supports the rear of the powertrain. Cars typically have between two and four motor mounts.
Should I replace both engine mounts at the same time?
Yes, it is highly recommended. Engine mounts wear out at a similar rate. If one has failed, the other is likely not far behind. Replacing them in pairs ensures proper engine alignment and prevents the new mount from being stressed by an old, worn-out mount on the other side. GM service information also recommends replacing both mounts.
🎬 Watch this step-by-step guide to replacing your Avalanche engine mountsWhat's the difference between hydraulic and solid rubber mounts?
Hydraulic (or fluid-filled) mounts are designed to provide superior vibration damping for a smoother ride. However, they can leak and fail, which is a common issue on these trucks. Solid rubber mounts are simpler, more durable, and cannot leak. While they might transmit slightly more vibration into the cabin, many find the difference to be minimal and worth the added durability, especially with the H2 mount upgrade.
Is there a recall on Avalanche engine mounts?
No, there are no specific recalls from GM or the NHTSA for engine mount failure on the 2007-2013 Chevrolet Avalanche. The issue is considered a common wear-and-tear item, though service bulletins exist for related vibration issues.
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Technical Specifications
OEM Part Numbers: 25847739
The 2007-2013 Avalanche uses two engine mounts. The original driver-side mount is a hydraulic design known for failure. A recommended upgrade is the solid rubber mount from the Hummer H2, part number 25847739, which is a direct fit. The passenger side mount is a standard solid rubber design. Replacement requires lifting the engine slightly.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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