GMC Yukon 2016-2024 Automatic Transmission Mount: A Complete Guide
Stop the clunks and vibrations in your Yukon by understanding and choosing the right replacement transmission mount.
- The most common signs of failure are clunking noises when shifting and vibrations at idle.
- For the best results and to avoid new vibration issues, using an OEM/ACDelco hydraulic mount is recommended for the Yukon.
- Check for TSB 17-NA-166 if your primary complaint is a rough idle, as there is a specific repair procedure.
- While you can drive with a bad mount, ignoring it can put extra stress on engine mounts, driveshafts, and exhaust components.
Is Your Yukon Shaking or Clunking? Signs of a Bad Transmission Mount
A failing transmission mount will give you clear signs that something is wrong. The rubber inside the mount wears out over time from heat and stress, or it can break from fluid leaks. When it fails, it can no longer support the transmission properly or absorb vibrations. Watch out for these common symptoms:
- Clunking or Thumping Noises: This is the most common sign. You might hear a loud clunk or bang from under the vehicle when you shift from Park into Drive or Reverse. The noise can also happen when you accelerate hard or brake suddenly. This sound is the transmission itself moving and hitting the frame.
- Excessive Vibrations: If you feel new vibrations through the floor, seats, or steering wheel, a bad mount could be the cause. This is often worst when you are stopped at a light with the Yukon in Drive.
- Engine and Transmission Movement: A worn mount allows the whole powertrain to rock back and forth. You might feel a lurch when you take off from a stop. In some cases, you can even see the engine move excessively if a helper revs the engine while the hood is open.
Known Issue: Vibration at Idle (TSB 17-NA-166)
General Motors released a Technical Service Bulletin (TSB) for 2015-2019 Yukons that have a noticeable vibration when idling in Drive. This problem can be caused by the engine or transmission mounts. The fix involves a specific procedure to install and settle the new mounts to prevent the vibration from returning. If your main symptom is vibration at idle, make sure your mechanic is aware of this bulletin.
Choosing the Right Aftermarket Mount: OEM vs. Aftermarket
When replacing your Yukon's transmission mount, you have a choice between original equipment (OEM) parts from GM/ACDelco and aftermarket parts from brands like Anchor, DEA, and Westar. For this specific vehicle, the choice matters.
- OEM (ACDelco): The original mounts on your Yukon are often hydraulic (fluid-filled). This design is excellent at absorbing the V8 engine's vibrations. For the smoothest ride that feels like new, an OEM or ACDelco Genuine GM part is the safest bet.
- Aftermarket Brands: Most aftermarket mounts are made of solid rubber. While they are more affordable, they may not dampen vibrations as well as the original hydraulic design. Some owners report that using budget aftermarket mounts can lead to a rougher idle. Among aftermarket options, forum users suggest Pioneer often has a better finish, while Anchor, DEA, and Westar are considered budget-friendly choices that may have compromises in material quality or fit.
Pro Tip: If your main goal is to restore the original smooth ride and eliminate vibrations, spending a little more on an OEM/ACDelco mount is often worth it for this truck.
How Much Does a GMC Yukon Transmission Mount Replacement Cost?
The cost to replace the transmission mount depends on the parts you choose and local labor rates. The job typically takes a mechanic about one hour.
| Part/Service | Estimated Cost |
|---|---|
| New OEM (ACDelco) Part | $45 - $115 |
| New Aftermarket Part | $12 - $71 |
| Shop Labor | $75 - $110 |
| Total Professional Replacement | $120 - $285 |
Frequently Asked Questions
How many transmission mounts does my Yukon have?
The 2016-2024 GMC Yukon has one rear transmission mount that attaches the transmission to a frame crossmember. It works together with two engine mounts at the front of the vehicle.
Are there any recalls for the transmission mount?
No, there are no recalls specifically for the transmission mount on the 2016-2024 GMC Yukon. There have been recalls for other transmission components like control valves, but these do not involve the mount itself.
Can I replace the transmission mount myself?
Yes, this is a job a skilled DIYer can do. It requires safely lifting the vehicle on jack stands, supporting the transmission with a floor jack and a block of wood, and removing the crossmember to access the mount. You will need basic hand tools, sockets (15mm and 21mm are common), and a torque wrench. However, due to the weight of the components, if you are not comfortable working under the vehicle, it's best to leave it to a professional.
Is this the same as an engine mount?
No, they are different parts but do a similar job. The engine mounts support the engine at the front, while the transmission mount supports the transmission at the rear. If one has failed due to age, it's a good idea to inspect the others, as they have all experienced the same amount of wear. It is common to replace them at the same time.
Technical Specifications
OEM Part Numbers: 23134733 23277115 23242576 84357861
The GMC Yukon uses a single rear transmission mount, typically attached to a frame crossmember. OEM versions are often hydraulic (fluid-filled) for superior vibration damping, while most aftermarket options are solid rubber.
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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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