Chevrolet Blazer Automatic Transmission Mount: A Complete Guide (2019-2025)
Feeling a clunk or vibration in your Blazer? Your transmission mount might be the reason.
- The most common symptoms of a bad transmission mount on a Blazer are cabin vibrations at idle and clunking noises when shifting.
- You can drive with a bad mount, but it should be repaired soon to prevent damage to other drivetrain and exhaust components.
- OEM mounts offer the best performance for ride comfort; aftermarket brands like Anchor and DEA are cheaper but may increase vibration.
- Inspect your engine mounts at the same time, as they wear at a similar rate and a failed mount puts more stress on the others.
Symptoms of a Failing Transmission Mount
A transmission mount wears out over time from constant use and exposure to the elements. When it fails, the symptoms are usually easy to notice. Since the part's job is to absorb vibration and control movement, a bad mount will do the opposite.
🎬 Watch: How to diagnose bad engine and transmission mounts- Excessive Vibration: This is the most common sign. You may feel a strong vibration through the floor, seats, or steering wheel, especially when the Blazer is idling at a stoplight while in gear.
- Clunking or Banging Noises: A loud "clunk" when you shift from Park to Drive or Reverse, or during acceleration and braking, is a tell-tale sign. This noise is the transmission moving excessively and hitting the frame or other parts.
- Rough Shifting: While the mount doesn't directly control shifting, its failure can misalign the drivetrain, which may lead to a rough or jerky feeling when the transmission changes gears.
Known Issues: Transmission Recall
While there are no specific recalls for transmission mounts on the 2019-2025 Blazer, there was a recall for some 2019-2020 models (GM recall N202313440). This recall concerned missing bolts on the start/stop accumulator, which could lead to a transmission fluid leak and loss of power. If you have concerns about your transmission, it's wise to check if your VIN was affected by this recall, though it is unrelated to the mount itself.
Choosing the Right Aftermarket Part: OEM vs. Aftermarket
When replacing your Blazer's transmission mount, you have a choice between Original Equipment Manufacturer (OEM) and aftermarket parts. OEM mounts are the same parts Chevrolet installs at the factory. They are guaranteed to fit and provide the intended ride quality. Aftermarket parts are made by other companies to fit your vehicle.
- OEM Quality: Generally considered the highest quality, especially for parts designed to manage noise and vibration. They are more expensive but offer peace of mind.
- Aftermarket Quality (Anchor, DEA): Brands like Anchor and DEA are budget-friendly alternatives. Reviews for these brands are very mixed. Some owners find them to be a good value, while others report they use harder rubber that can increase cabin vibration compared to the original part, or that they fail prematurely. For a daily-driven vehicle where ride comfort is a priority, an OEM mount is often the better long-term choice. If budget is the primary concern, an aftermarket mount will get the job done, but may come with a compromise in vibration damping.
Cost to Replace a Blazer Transmission Mount
The total cost depends on the price of the part and the cost of labor. This is a job that can be done by a DIYer with the right tools, but many owners will opt for a professional mechanic.
| Item | Estimated Cost |
|---|---|
| New OEM Part | $66 - $109 |
| New Aftermarket Part | $83 - $95 |
| Shop Labor | $133 - $196 |
| Total Professional Replacement | $200 - $305 (Aftermarket) / $200 - $350 (OEM) |
Pro Tip: While replacing the transmission mount, it's a good idea to have the engine mounts inspected as well. They experience similar wear and tear, and replacing them at the same time can save on future labor costs.
🎬 See this swap walkthrough for similar GM powertrain mountsFrequently Asked Questions (FAQ)
Can I drive with a bad transmission mount?
You can, but it's not recommended for long. Continuing to drive with a failed mount puts extra stress on other components like CV axles, driveshafts, exhaust pipes, and the engine mounts. This can lead to more expensive repairs down the road.
How long should a transmission mount last?
Transmission mounts are designed to last a long time, often over 100,000 miles. However, factors like rough driving conditions, climate, and exposure to leaking fluids can cause them to wear out sooner.
Is a transmission mount the same as an engine mount?
No, but they perform a similar function. Engine mounts support the engine, while the transmission mount supports the transmission. Together, they make up the vehicle's powertrain mounting system.
Is this a difficult DIY repair?
For an experienced DIYer, it's a manageable job. The process involves safely lifting and supporting the vehicle on jack stands, then using a floor jack with a block of wood to support the transmission's weight. After that, it's a matter of unbolting the old mount and installing the new one. 🎬 Watch: Step-by-step guide to replacing a transmission mount The main challenges are safety and having enough space to work under the vehicle.
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Technical Specifications
OEM Part Numbers: 84499831 84523788
The 2019-2025 Chevrolet Blazer uses several mounts to secure the powertrain. The specific automatic transmission mount connects the transmission case to the vehicle's subframe. It is typically a non-hydraulic design made of rubber and metal.
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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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