A Guide to the 2008-2019 Cadillac CTS Automatic Transmission Mount
Learn to identify and solve the clunks, vibrations, and noises caused by a failing transmission mount on your CTS.
- The most common symptoms are clunking when shifting and vibration at idle; distinguish these from the well-known transmission 'shudder' TSB.
- Replacement is complicated by the exhaust system, which often requires being cut for access, increasing labor time and difficulty.
- Aftermarket brands like Anchor and DEA are budget options but have a reputation for poor quality control and short lifespans compared to OEM.
- Driving with a failed mount is possible but not advised, as it puts extra strain on engine mounts, the driveshaft, and exhaust components.
Is Your Cadillac CTS Making a Clunking Noise?
A failing automatic transmission mount is a common issue that can disrupt the smooth performance of your CTS. When the rubber insulator wears out, cracks, or separates, the transmission can move excessively under torque. This leads to several distinct symptoms that you might hear and feel while driving.
Top Symptoms of a Bad Transmission Mount:
- Clunking or Thudding Noises: The most frequent complaint is a loud clunk or bang when you shift gears, especially from Park into Drive or Reverse. You may also hear it during hard acceleration or sudden braking. This is the sound of the transmission assembly moving and hitting the vehicle's crossmember.
- Excessive Cabin Vibration: You may feel a new, persistent vibration in the steering wheel, floorboards, or seats. This is most noticeable when the car is in gear and stopped at a light, or when accelerating.
- Engine and Drivetrain Movement: In severe cases, the entire engine and transmission assembly will lurch forward or backward when you accelerate or decelerate. A mechanic can easily spot this by having an assistant hold the brakes and shift between Drive and Reverse while observing the engine bay.
Don't Confuse a Bad Mount with Other Common CTS Issues
Your 2008-2019 CTS may have other issues that cause similar symptoms. It's important to rule them out:
- 8-Speed Transmission Shudder (TSB 19-NA-018): Many CTS models with 8-speed transmissions can develop a vibration that feels like driving over rumble strips during light acceleration. This is a known torque converter issue fixed with a specific transmission fluid flush, not a mount replacement.
- Shifter Cable Recall (GM #14179): Some 2014 CTS models were recalled for a shift cable that could detach. This would prevent you from changing gears or properly engaging Park, but it does not typically cause clunking or vibration while driving.
Choosing the Right Aftermarket Transmission Mount
When shopping for a new aftermarket mount, you'll find a few brands available. Quality can vary significantly, which impacts how well the part absorbs vibration and how long it lasts. Given that replacement can be labor-intensive, choosing the right part is important to avoid doing the job twice.
Aftermarket Brand Tiers for Cadillac CTS
- Better Quality Aftermarket (Pioneer): Pioneer is generally regarded as a higher-quality aftermarket option. Forum users have noted that their mounts often look and feel similar to the original factory parts. While still a step below OEM, this is often the best choice if you are not buying a genuine factory part.
- Economy Aftermarket (Anchor, DEA): Brands like Anchor and DEA are widely available and very affordable. However, their quality and durability are inconsistent according to many owner experiences. While some users report no issues, many others have experienced premature failure, with vibrations and noises returning shortly after installation. These are best considered a budget-friendly, but potentially short-term, solution.
Pro Tip: For this specific part on a Cadillac, paying more for an OEM (AC Delco) part is often recommended by mechanics. The superior rubber compound provides better vibration damping, and the labor required for replacement makes you want to use a part that will last.
Cost of Replacing a Cadillac CTS Transmission Mount
| Part/Service | Estimated Cost |
|---|---|
| New OEM (AC Delco) Mount | $220 - $270 |
| New Aftermarket Mount | $12 - $75 |
| Shop Labor | $150 - $300 |
| Total Professional Replacement (Aftermarket) | $162 - $375 |
| Total Professional Replacement (OEM) | $370 - $570 |
Frequently Asked Questions
How difficult is it to replace the CTS transmission mount?
The replacement itself is simple, but access makes it difficult. The exhaust pipes run directly underneath the transmission crossmember where the mount is located. On many vehicles, especially those in areas where road salt is used, the exhaust bolts will be rusted and may break upon removal. The common professional workaround is to cut the exhaust pipe for access and weld it or clamp it back together afterward. This makes the job a 3 out of 5 in difficulty.
Can I drive with a bad transmission mount?
You can, but it is not recommended for an extended period. The excessive movement puts significant stress on other expensive components like the engine mounts, driveshaft, CV joints, and exhaust system, which can lead to more costly repairs down the road.
Does my AWD CTS use the same mount as a RWD model?
Part numbers often differ between Rear-Wheel Drive (RWD) and All-Wheel Drive (AWD) models, as well as between different generations and engine types. Always verify the part fits your specific vehicle configuration before ordering.
Will a new mount fix my transmission shudder?
No. A bad mount causes clunks and constant vibration. A 'shudder' that feels like driving over rumble strips is almost always related to the torque converter or transmission fluid, as outlined in GM's technical service bulletins.
Helpful Videos
Technical Specifications
OEM Part Numbers: 19418513 22849846 23229913
The mount consists of a cast aluminum or steel housing bonded to a solid or hydraulic rubber insulator. It bolts to the transmission tail housing and the vehicle's central crossmember. Part numbers vary by RWD vs AWD and generation.
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.
- Cadillac CTS:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Cadillac CTS Making a Clunking Noise?
- Top Symptoms of a Bad Transmission Mount:
- Don't Confuse a Bad Mount with Other Common CTS Issues
- Choosing the Right Aftermarket Transmission Mount
- Aftermarket Brand Tiers for Cadillac CTS
- Cost of Replacing a Cadillac CTS Transmission Mount
- Frequently Asked Questions
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