GMC Sierra 2007-2014 Automatic Transmission Mount: A Complete Guide
If you feel a clunk or vibration when you put your truck in gear, your transmission mount might be the culprit.
- A clunking noise when shifting gears is the most common symptom of a failed transmission mount.
- Aftermarket brands like Anchor, DEA, and Westar offer a cost-effective solution that is suitable for this repair.
- This is a straightforward DIY job that can be done with basic tools in about 1-2 hours.
- Ensure you buy the correct mount for your truck's drivetrain, as 2WD and 4WD models use different parts.
Is Your Sierra's Transmission Mount Failing?
The transmission mount is a part that wears out over time from constant use, heat, and exposure to the elements. When it fails, the symptoms are usually easy to notice. Look out for these common signs of a bad transmission mount on your 2007-2014 Sierra.
Common Failure Symptoms
🎬 Watch: 7 common signs of a failing transmission mount- Clunking or Banging Noises: This is the most common sign. You might hear a loud clunk when you shift from Park to Drive or Reverse, or during hard acceleration. This is the sound of the transmission moving too much and hitting the frame.
- Excessive Vibrations: A worn mount can no longer absorb vibrations properly. You may feel a new or unusual vibration in the cabin, through the floor, or in the steering wheel, especially when idling in gear.
- Engine and Transmission Movement: If the mount is broken, the whole engine and transmission assembly can move more than it should. You might feel a lurch or thud when you accelerate or brake suddenly.
Choosing the Right Aftermarket Mount
When replacing the transmission mount on your Sierra, you don't have to buy an expensive OEM part from the dealer. Aftermarket parts can offer similar quality for a much lower price. The brands available for your truck generally fall into a standard, budget-friendly category.
- Standard Aftermarket (Anchor, DEA, Westar): These brands are widely available and are considered budget-friendly, standard replacement options. They are designed to meet original equipment specifications and are a popular choice for daily drivers. For a part like a transmission mount on a workhorse truck, these brands provide a good balance of value and performance.
- OEM (Original Equipment Manufacturer): The original GM part is the most expensive option. While it guarantees a perfect fit, a quality aftermarket part can perform just as well for this specific application at a fraction of the cost.
Pro Tip: There are different part numbers for 2-wheel drive (2WD) and 4-wheel drive (4WD) models. Always verify the part fits your specific truck configuration before purchasing.
Cost to Replace a 2007-2014 GMC Sierra Transmission Mount
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $12.47 - $63.07 |
| New OEM Part | $65 - $162 |
| Shop Labor | $98 - $143 |
| Total Professional Replacement (Aftermarket Part) | $110 - $206 |
Frequently Asked Questions (FAQ)
Can I replace the transmission mount myself?
Yes, this is a very DIY-friendly job for someone with basic mechanical skills and tools. The process involves supporting the transmission with a jack and a piece of wood, unbolting the crossmember and the old mount, and bolting the new one in place. It typically takes about one to two hours.
🎬 See this step-by-step Sierra transmission mount replacement walkthroughIs it the engine mount or the transmission mount?
Your Sierra has two engine mounts and one transmission mount. While the symptoms are similar, a bad transmission mount is often felt more as a clunk when shifting gears. A bad engine mount might cause more vibration at idle. It's a good idea to inspect all three mounts, 🎬 Learn how to check for bad engine and transmission mounts as they often wear out around the same time.
Will a bad transmission mount cause other problems?
Yes. If you ignore a bad mount, the excessive movement can put stress on other parts like driveshaft joints, exhaust pipes, hoses, and wiring. In severe cases, it can even affect shifting quality. Replacing it promptly is the best course of action.
Do I need a 2WD or 4WD mount?
It depends on your truck. The 2WD and 4WD models for the 2007-2014 Sierra use different transmission mounts. Make sure to order the correct part for your specific drivetrain to ensure proper fitment.
Were there any recalls for the transmission mount?
No, there have been no specific recalls issued by the NHTSA for the automatic transmission mount on the 2007-2014 GMC Sierra. However, several Technical Service Bulletins (TSBs) exist for shudder and vibration issues related to the transmission and engine mounts in this generation, indicating they are a common wear item.
Helpful Videos
Technical Specifications
OEM Part Numbers: 15813693 15840278
The primary difference in parts is between 2-wheel drive and 4-wheel drive configurations. The mount consists of a metal frame bonded to a rubber or fluid-filled core to absorb vibration.
We Have This Part in Stock
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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