A transmission leak isn’t the worst malady for a vehicle to have, but it’s still best to avoid them when possible. Most engines can hold four to six quarts of oil. Transitions, meanwhile, only hold one-and-a-half to three quarts of fluid. So, even a small leak can make a difference extremely quickly quickly. Not to mention, a leak can cost you between 100 and 200 dollars if you take your car to a shop (If you have to replace your transmission you’re looking at a lot more). Luckily, you can avoid a trip to the mechanic completely by following our guide. Everything you need to know about how to fix a transmission leak is right here! Additionally, BlueDevil transmission sealer is designed to stop transmission leaks in their tracks and get your transition back in working order. Find out more about our stop-leak product below!
How to Fix a Transmission Leak
With a manual transmission, there are really only two things that can cause a transmission to fail prematurely other than normal wear and tear: poor driving habits and an improper level/type of transmission fluid. If you have issues with your automatic transmission, check out our blog on how to identify and fix a hard shifting automatic transmission.
Where Is the Leak Coming From?
If you’ve noticed transmission fluid leaking from the front of the car or sitting under your parked car, you’ve most likely got a leak. If you’re thinking about fixing the leak by hand, the first thing you need to do is locate the leak. Here are the most common places you’ll find a leak in your transmission:
- Cooler Lines
- Dipstick tube O-ring
- Input seal
- Output seal(s)
The most common transmission fluid leak location is from the transmission cooler lines. Every automatic transmission pumps the fluid either through a cooler in the vehicle’s radiator, an auxiliary cooler, or both to help warm the fluid when you first start driving and to help cool the fluid once it has reached normal operating temperatures. The lines to and from these coolers are simply rubber hoses that can leak at the connection and crimp points. It is usually easiest to find where these lines exit your transmission then follow them up to the front of your vehicle looking for leaks. If you find a leak the best thing to do is replace the line.
Dipstick Tube O-ring
The dipstick you use to measure the fluid level in your transmission fits into a tube or standpipe. That tube has an o-ring where it enters the transmission and as that o-ring gets old and dried out it can allow fluid to sneak past it and leak out. Dipstick tube o-rings often leak intermittently and more when your vehicle is parked on a hill or slope. Replacing this o-ring is often a very easy do-it-yourself job so you may consider tackling it if you find this as your leak location.
Input Shaft Seal
This is the least common leak point in any transmission because it is hidden behind inside the bellhousing where it is safe from dirt, dust and other things that destroy seals. If your input shaft seal is leaking, then you will see transmission fluid dripping from the front of your bellhousing. IReplacing the seal will require removing your transmission which can be an expensive job. If that doesn’t make sense for your or your vehicle, use BlueDevil Transmission Sealer to restore that seal and stop the leak.
Output Shaft Seal
Leaking output shaft seals is a very common leak point. If you have a transmission fluid leak at the output shaft seal you will see evidence of fluid leaks where your CV axle exits your transmission or where the driveshaft exits the transmission on a rear wheel drive vehicle. Replacing these seals does not require removing the transmission so check with your mechanic to see if that makes sense for you. If not, BlueDevil Transmission Sealer can seal this leak as well!
How to Quickly Fix Any Transmission Leak
Transmission Leaks can be costly issues that leave your car in the shop for days. With BlueDevil Transmission Sealer, they don’t have to be. Our expertly crafted sealing solution is designed to restore your transmission and seal leaks fast! For a fraction of the price and time that a visit to your nearest service shop will cost you, our sealant will put kick your transmission back into shape. Learn more below!
Pickup BlueDevil Transmission Sealer at any of our partnering local auto parts stores:
- Advance Auto Parts
- Bennett Auto Supply
- CarQuest Auto parts
- NAPA Auto Parts
- O’Reilly Auto Parts
- Pep Boys
- Fast Track
- Bumper to Bumper Auto Parts Specialists
- S&E Quick Lube Distributer
- DYK Automotive
You can also purchase BlueDevil Transmission sealer directly from BlueDevil here.
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