A Practical Guide to the 2004-2013 INFINITI QX56 Transmission Mount
Stop the clunks and vibrations by choosing the right replacement transmission mount for your QX56.
- The most critical step is to verify if your QX56 is 2WD or 4WD, as the transmission mounts are different and not interchangeable.
- Symptoms of failure include clunking noises when shifting, excessive vibration at idle, and a jerking feeling on acceleration.
- While budget aftermarket brands like Anchor, DEA, and Westar are cheap, they are widely reported to cause vibration and fail prematurely in heavy vehicles.
- Replacing a failed mount is important to prevent costly damage to other parts like the driveshaft, engine mounts, and exhaust system.
Is Your QX56's Transmission Mount Failing?
The transmission mount is a wear-and-tear part. The rubber can crack, collapse, or separate from the metal frame over time due to age, heat, and stress from the engine's torque. When it fails, the symptoms are hard to ignore. Because the QX56 shares its platform with the Nissan Armada and Titan, they all share similar signs of mount failure.
Common Symptoms of a Bad Mount:
- Clunking or Banging Noises: A loud "clunk" or "thud" when you shift from Park into Drive or Reverse is a classic sign. You may also hear this noise during hard acceleration or braking as the transmission shifts in its cradle.
- Excessive Vibration: You might feel a new, heavy vibration through the floor, seats, or steering wheel, especially when the QX56 is idling in gear. This vibration is caused by the engine and transmission's movements being transferred directly to the vehicle's frame instead of being absorbed by the mount's rubber.
- Jerking or Lurching: When the mount is worn, the transmission can rock excessively under load. This can feel like a jerk or lurch when you accelerate from a stop.
Pro Tip: Before replacing the mount, check that the mount's bolts are tight. On some early models of this vehicle platform, loose factory bolts caused clunking noises that mimic a failed mount.
Choosing the Right Aftermarket Transmission Mount
When replacing the transmission mount on your QX56, you have a choice between an Original Equipment Manufacturer (OEM) part and several aftermarket brands. While aftermarket parts are cheaper, quality can vary significantly.
Critical Ordering Information: 2WD vs. 4WD
The most common mistake is ordering the wrong mount for your drivetrain. The mounts for 2-Wheel Drive (2WD) and 4-Wheel Drive (4WD) models are DIFFERENT and NOT interchangeable. The 4WD mount is shorter and bolts to the transfer case, while the 2WD mount is taller. Always verify your vehicle's drivetrain before ordering.
Aftermarket Brand Tiers for Your QX56
Based on owner feedback and mechanic reviews, aftermarket mounts for this vehicle generally fall into two categories:
- Better Quality Aftermarket (Pioneer): Pioneer mounts have a reputation for being closer to OEM quality in terms of fit and function. The company states they use application-specific rubber compounds and a "Sure-Fit System" to ensure proper installation and vibration damping. For a heavy vehicle with a V8 engine like the QX56, a higher-quality rubber is essential for a smooth ride.
- Standard/Economy Aftermarket (Anchor, DEA, Westar): These brands are widely available and very affordable. However, numerous forum discussions report issues with these brands, including poor fitment, increased cabin vibration, and a short service life. Many owners report that the rubber used is too hard, which fails to absorb vibrations effectively, or too soft, leading to premature failure. While the initial cost is low, you may end up replacing the part again sooner than you'd like.
Cost of Replacing the Transmission Mount
The total cost depends on whether you do the work yourself or hire a professional. The part itself is affordable, but labor will add to the final price.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Infiniti) | $130 - $150 |
| New Aftermarket | $57 - $93 |
| Shop Labor | $100 - $185 |
| Total Professional Replacement | $230 - $335 |
Frequently Asked Questions (FAQ)
Can I drive my QX56 with a bad transmission mount?
Yes, but it's not recommended for long. Continuing to drive puts significant stress on your engine mounts, driveshafts, exhaust system, and various hoses and wires. This can lead to more expensive repairs down the road.
Is this a difficult DIY job?
For a DIYer with the right tools, this is a manageable job. It typically takes 1-2 hours. The process involves safely lifting the vehicle, supporting the transmission with a jack and a block of wood, removing the crossmember bolts, and swapping the mount. Ensure you have a torque wrench to tighten the bolts to factory specifications upon reassembly.
Is the OEM mount better than aftermarket for the QX56?
For a heavy luxury SUV like the QX56, the quality of the rubber in the mount is critical for ride comfort. While some premium aftermarket brands may perform well, economy brands often lead to increased vibration. The OEM mount is designed specifically to handle the vibration characteristics of the 5.6L V8 engine and is a reliable choice for restoring the original smooth ride.
Are there any recalls for the QX56 transmission mount?
No, as of early 2026, there are no specific recalls or Technical Service Bulletins (TSBs) from INFINITI or NHTSA for the transmission mount on 2004-2013 QX56 models.
Technical Specifications
OEM Part Numbers: 11320-ZZ50A (4WD) 11320-7S100 (4WD, superseded) 11320-ZZ50B (2WD) 11320-7S000 (2WD, superseded)
The mount consists of a steel frame and bracket with a central block of natural and styrene-butadiene rubber designed to support the transmission and dampen vibration. The design differs significantly between 2WD and 4WD models.
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.
- INFINITI QX56:
- 🛍️ Shop This Part
- Is Your QX56's Transmission Mount Failing?
- Common Symptoms of a Bad Mount:
- Choosing the Right Aftermarket Transmission Mount
- Critical Ordering Information: 2WD vs. 4WD
- Aftermarket Brand Tiers for Your QX56
- Cost of Replacing the Transmission Mount
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off