When everything is functioning the way it should, there’s no reason to worry. But when you start to feel things shifting around as you drive, that should be more than just a little concerning.
When your transmission mounts start to wear down, that’s precisely what can happen. This can lead to tons of problems and expensive repairs. In this guide, we’ll break down the five most common symptoms of a bad transmission mount, where you can find them, what they do, and how much it costs to replace them.
Symptoms of a Bad Transmission Mount
- Clunking, Bashing, or Banging Noises
- Excessive Vibrations
- Chassis Flex
- Drooping or Sagging Engine/Transmission
- Cracked or Worn Bushings
While a bad transmission mount can lead to more expensive repairs if you don’t get it fixed, if you don’t know what’s going on and what to look out for, you’ll have no idea that your transmission mounts are the problem.
If your transmission mount is damaged, you’ll need to replace it as soon as possible to prevent further damage. The most common damage is broken engine mounts, but that can quickly spread to hoses, belts, and even your vehicle chassis.
A repair that should’ve only cost you a couple of hundred bucks can quickly turn into a thousand-dollar issue if you don’t repair it promptly.
Here is a more detailed list of the most common symptoms of a bad transmission mount:
1. Clunking, Bashing, or Banging Sounds
Your transmission mount holds your transmission in place, so if it starts to wear down or breaks altogether, you can expect to hear all kinds of noise as it shifts around. These noises will be especially prominent while turning, accelerating, braking, or starting and turning off your vehicle.
The noise’s exact sound will vary based on how damaged your transmission mount is and by the type of vehicle that you drive.
2. Excessive Vibrations
When something as big as your transmission is shifting around, you’re bound to feel it. While you’ll feel large shifts as your transmission slams into different parts of your vehicle, before it gets that bad, you’ll feel everything as vibrations.
Just as the noises get worse under certain circumstances, those vibrations can get worse too. The more the transmission shifts, the more you’ll feel these vibrations. If the problem gets bad enough, you might feel vibrations every time your vehicle is running.
3. Chassis Flex
If your transmission mount is damaged enough, and you don’t repair it, it can start to damage your vehicle’s chassis. Each time the transmission shifts, it slams into the frame, extending that force to the chassis.
The more that it does this, the more force it puts on the chassis. If it does it enough, damage can be the result. Repairing your vehicle’s chassis is an extremely expensive process, and sometimes it’s the total cost simply isn’t worth it.
4. Drooping or Sagging Engine/Transmission
Before diving too deep into the weeds to find out what’s going on – just take a look at what’s happening under your vehicle. If you look underneath and see that your engine or transmission is sagging or out of place, you need a new engine or transmission mount.
Also, be prepared that having your transmission or engine sag like that might have damaged some other components that you need to repair now too.
5. Cracked or Worn Bushings
Even if you look underneath and don’t see a sagging or drooping transmission or engine, that doesn’t mean that everything is fine – it just means that it hasn’t got that bad yet. Take a closer look at the bushings.
If they’re cracked or worn out, you probably need to replace them. The good news is that you’re catching the problem early and you shouldn’t need any extra repairs yet. But that doesn’t mean you should put it off, because these small cracks can quickly turn into big problems if you don’t replace them.
The Function of a Transmission Mount
If you break down the name, a transmission mount does exactly what you think it does – it’s what mounts your transmission to the frame. The frame is the only component on your vehicle sturdy enough to handle all the weight that comes with your engine and transmission, and the mounts keep it from shifting around while you’re driving.
This might sound simple enough, but if it’s not working correctly, you’ll run into all kinds of problems.
Transmission Mount Location
The transmission mount is located between the frame and the transmission. The transmission mount location differs a little bit depending on if you have a front-wheel-drive, rear-wheel-drive or 4wd, because of the different transmissions.
Finding your transmission mount is easier than you think. First, locate your transmission and find where it intersects with your vehicle’s frame. This is where you’ll find your transmission mount.
The transmission mount will usually have a bolt running through the frame and your transmission connecting them with a nut. The bolt will also run through the bushing itself, which can be inset into the frame.
Everywhere that your transmission connects to your frame will have a transmission mount. Otherwise, you’d have a metal-on-metal connection that would lead to a ton of premature wear and damage.
Transmission Mount Replacement Cost
A transmission mount costs 10$ to 100$ and the replacement costs 100$ to 150$. You can expect a total replacement cost of 110$ to 250$ at a repair workshop.
The good news is that a new transmission mount is often pretty cheap, ranging anywhere from $10 to $100. The bad news is that unless you have a transmission jack, you’ll probably need to take it to a repair shop.
Overall, labor usually doesn’t cost too much to replace a transmission mount, typically ranging from $100 to $150. This all comes down to what you drive and how easy it is to access the transmission.
But usually, you won’t have to disconnect the engine from the transmission to replace the mount, making the job easier and cheaper. Not only does this save you money on labor, but that means that the only part you’ll need to replace is the mount itself.
If you have access to a transmission jack and the technical know-how to do the job safely, you should be able to complete the entire job for under $100. If you’re taking it to a shop for repairs, it will typically cost you anywhere from $105 to $220, depending on the specific transmission mount that your vehicle uses.
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Founder, owner & main author of Mechanic Base. I have been repairing cars for more than 10 years, specialized in advanced diagnostics & troubleshooting. I have also been a drifting driver and mechanic for over 7 years.