Transmission mount replacement
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Transmission mount replacement
How much does a transmission mount replacement cost?
The transmission in any vehicle is the component that harnesses the engine’s power and turns it into usable and controllable energy.
For it to do so, the transmission must be securely fastened in place. One or more transmission mounts keep the transmission firmly in place.
The transmission mounts experience a lot of stress, especially under hard acceleration.
Many transmission mounts will last your car’s full lifetime, although they can deteriorate with time and under harsh operating conditions.
The type of mount matters when it comes to costs as the parts and labour for transmission mount replacement varies from around $100 to $650 or more, depending on the make and model you drive.
Cars operated in stop-and-go conditions more frequently will require transmission mount replacement more often.
What is a transmission mount?
The purpose of a transmission mount is to keep your transmission secured in your car and well-supported while allowing for slight motion.
On rear-wheel drive models, the transmission mount is typically a cradle underneath the extension housing while on front-wheel-drive and AWD cars, the transmission mount commonly secures the transmission with an arm on top mounted to the vehicle frame.
The ends are bolted so there’s no chance of excessive motion that could cause problems.
Transmission mounts are usually cast from either aluminum or pressed from steel and reinforced for strength.
A rubber or polyethylene bushing is used at the mounting point, and often where the mount attaches to the car’s body or frame, to allow or slight movement and isolate vibration and noise.
Once the transmission mount has cracked or bent, or if the mount’s bushing has deteriorated, the transmission mount will need to be replaced.
Symptoms that your transmission mount requires replacement
- Knocking noise under your car on acceleration
- Increased cabin noise while the engine is running
- Vibration through the steering wheel or felt in cabin while driving
How is a transmission mount replacement performed?
- On rear-wheel-drive cars, the technician lifts the car on a hoist or jack stands
- Skid plates or heat shields are removed to allow access to the transmission mount
- The broken mount is unbolted and removed and a new mount is fitted
- On front-wheel-drive and AWD cars, the technician often works on the car on the floor
- From the top, a path is cleared to the transmission mount, often requiring air cleaner box removal, disconnecting wiring, moving hoses
- The broken transmission mount is removed and a new one fitted
- The engine bay is reassembled as it was
- In both situations, the technician road tests to confirm the symptom has been corrected
Tips to remember
- The transmission must always be supported from underneath while the mount is being replaced
- Some cars may have more than one transmission mount; others may consider the transmission mount as a motor mount
How important is transmission mount replacement?
Having your transmission mount replaced at the first signs of failure gives you confidence that your car will work properly in any driving conditions.
Driving your car with a broken or worn transmission mount can cause drivability issues as well as possibly damage the transmission or engine case due to excessive torque and movement.
This can be aggravating and exponentially increase repair costs.
If you’ve read this far, you obviously care about your car. A lot. So next time you need a service, repair or inspection, visit AutoGuru.com.au.
We let you search and book from over 1,600 qualified mechanics, who eat car troubles for breakfast.
