Chrysler 300 (2005-2017) Automatic Transmission Mount: A Comprehensive Guide
Experiencing clunks or vibrations in your Chrysler 300? Your transmission mount might be the culprit.
- The most common symptoms of failure are clunking noises when shifting and vibrations at idle.
- Replacement is a DIY-friendly job for most home mechanics, with a difficulty of 2 out of 5.
- Aftermarket mounts are cost-effective, but OEM or premium aftermarket brands may provide a smoother, quieter ride.
- Driving with a failed mount can cause damage to other components like engine mounts and the driveshaft.
Is Your Chrysler 300 Making a Clunking Noise?
A failing automatic transmission mount is a common issue on the Chrysler 300 platform. Since this part is made with rubber, it wears out over time from heat, stress, and exposure to the elements. When it fails, it can no longer hold the transmission steady or absorb vibrations, leading to noticeable symptoms. 🎬 Watch this video to identify common bad transmission mount symptoms. The most common sign is a loud clunk or bang when you shift from Park into Drive or Reverse. You might also feel excessive vibrations in the cabin, especially at idle or during acceleration.
Don't Ignore the Signs
While you can technically drive with a bad transmission mount, it's not recommended for long periods. A failed mount puts extra stress on your engine mounts, driveshaft, and exhaust system, which can lead to more expensive repairs down the road.
Choosing the Right Aftermarket Mount
When shopping for a replacement, you'll find original equipment (OEM) Mopar parts and several aftermarket brands. Here's an honest breakdown to help you choose:
- OEM (Mopar): This is the original part your car came with. It guarantees perfect fit and quality, but it's the most expensive option. The Mopar part number 4578063AG is a common replacement for many models in this year range.
- Premium Aftermarket (e.g., Crown Automotive): Brands like Crown Automotive often aim to meet or exceed OEM quality and are a solid choice. Some owners report that premium aftermarket mounts provide a smooth, factory-like feel without the vibrations that can sometimes come from cheaper options.
- Standard/Economy Aftermarket (e.g., Anchor, DEA, Westar): These brands are widely available and very affordable. They are a popular choice for budget-conscious repairs. However, owner experiences are mixed; some find them perfectly adequate, while others report they wear out faster or cause more cabin vibration than OEM parts. For a daily driver where a smooth ride is important, you may want to weigh the cost savings against potential noise and vibration issues.
Pro Tip: When you replace the transmission mount, it's a good idea to inspect your engine mounts at the same time. If the transmission mount has failed, the engine mounts have likely been under extra strain and may also be worn.
🎬 Learn more about diagnosing mount failure and the repair process.Cost of Replacing a Chrysler 300 Transmission Mount
| Part Type | Estimated Cost |
|---|---|
| New OEM (Mopar) | $65 - $95 |
| New Aftermarket | $31.59 - $49.04 |
| Shop Labor | $75 - $190 |
Cost estimates are based on market research and may vary by location and vehicle specifications.
Frequently Asked Questions (FAQ)
Will a bad transmission mount cause a Check Engine Light?
It is very unlikely. The mount itself has no sensor to trigger a light. In extreme cases, if the transmission moves enough to damage a nearby sensor or wiring, it could indirectly cause a Check Engine Light, but this is rare.
Is this a DIY-friendly repair?
Yes, for a home mechanic with the right tools, this is a straightforward job. The process involves supporting the transmission with a jack, unbolting a crossmember, and then unbolting the mount itself. It typically takes about 1 to 2 hours.
🎬 See a step-by-step guide on how to replace the mount.Do I need to replace any other parts at the same time?
You don't have to, but it's highly recommended to inspect the two engine mounts. A failed transmission mount puts extra stress on them. If one mount has failed, the others may not be far behind.
Does this part fit both RWD and AWD models?
No, the transmission mount is often different for Rear-Wheel Drive (RWD) and All-Wheel Drive (AWD) models. Always verify the fitment for your specific vehicle before purchasing.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4578063AG 4578063AF 4578063AE 4578063AD 4578063AC 4578063AA
The mount consists of a steel frame with a natural/SBR rubber insulator designed to hold the transmission and absorb vibration. It is typically located on a crossmember underneath the vehicle at the rear of the transmission.
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.
- Chrysler 300: