Transmission leaks are often silent killers of cars. Many leaks in your vehicle will you give you an indication that the fluid level is low and is causing problems before there is any catastrophic damage done. For example, if your engine is leaking coolant and the level gets low your vehicle will often start to overheat, but so slowly that you have time to pull over, check your coolant level, and top things off before any damage is done. Many cars even have a low coolant light that comes on to let you know to add some coolant before the level even gets low enough to cause your car to overheat. Your engine oil also probably has a similar warning light, but your transmission does not.
If your transmission runs low on fluid it can cause serious problems. The transmission fluid in your car has 3 very important jobs:
- Accomplish gear changes
- Lubricate transmission components
- Cool transmission components
Accomplish Gear Changes
While inconsistent gear changes may be the most noticeable affect low transmission fluid will have, it is the only problem that doesn’t leave your transmission permanently damaged. Your transmission uses pressurized transmission fluid to move internal components to change gears and if your fluid level is low, the fluid won’t reach the pressure necessary to change gears. While this can be dangerous to drive your car like this, it won’t permanently damage the gears.
Lubricate Transmission Components
One of the most important tasks your transmission fluid has is to lubricate the components inside. This includes the gears and the bearings which are expected, but it also lubricates the shift components like the bands and clutches. Lastly, the transmission fluid keeps the seals in your transmission lubricated as well. Without lubrication seals like your front transmission seal can wear out more quickly and start to leak.
Cool Transmission Components
Lastly, your transmission fluid is used to cool transmission components. Your transmission fluid is actually run through your radiator and possibly a separate transmission cooler at the front of your car to help cool the fluid so it can cool in the components inside. If transmission fluid gets too hot it will lose its ability to properly lubricate things but it also can literally cook things inside your transmission. Your transmission has lots of different wiring and plastic components that don’t perform very well at high temperatures. One of the things that usually doesn’t last under high temperatures is the front transmission seal. High temperatures can cause these seals to get hard and brittle causing a front seal transmission leak.
If you’ve got a front seal transmission leak, you’ve got 2 options to fix it. First, can remove your transmission and replace the front seal. Second, you can use BlueDevil Transmission Sealer in your transmission to rejuvenate the front seal and stop the leak.
You can also find BlueDevil Transmission Sealer at any of our partnering local auto parts stores like:
- AutoZone
- 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 Distributor
- DYK Automotive
- Fisher Auto Parts stores
- Auto Plus Auto Parts stores
- Hovis Auto & Truck Supply stores
- Salvo Auto Parts
- Advantage Auto Stores
- Genuine Auto Parts stores
- Bond Auto Parts stores
- Tidewater Fleet Supply
- Bumper to Bumper Auto Parts
- Any Part Auto Parts
- Consumer Auto Parts
Pictures Provided By:
front_seal_transmission_leak.jpg – By Phantom1311 – Lisecned by Getty Images – Original Link
BlueDevil Products can be found on Amazon.com or at AutoZone, Advance Auto Parts, O’Reilly Auto Parts, NAPA, and other major auto parts retailers.
40 responses to "Sealing a Front Seal Transmission Leak"
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My 2008 Hyundai accent is leaking pretty bad will it still help?
Shane-
Thank you for asking about your Hyundai Accent. Unfortunately, the BlueDevil Transmission Sealer is intended for larger leaks. As long as the leak is not more than a seep or lightly dripping, you would be a good candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I had someone replace my transmission without changing the seal. The fluid is pouring out…. will this product work.
Angela-
The BlueDevil Transmission Sealer is intended for leaks that are seeping, or lightly dripping. Based on your description, you may be losing fluid a little too quickly for the product to be successful. Replacing the seal may be your best option.
Thank you!
-BDP
I have a 4l60e losing about a quart and a half month don’t know if it’s the torque converter or the front seal. Would this product work
Codi-
The BlueDevil Transmission Sealer would be able to treat the type of leak you’ve described. You would use one oz. of the product per quart of transmission fluid. Expect to start seeing improvement after 100-200 miles of driving.
Thank you!
-BDP
Will the blue devil work on a Ford 96 Taurus wagon front seal is gone I drive it for 5 mins and then it stop pulling?
Dvaizea-
Thank you for asking about your Ford Taurus. How quickly is the vehicle losing transmission fluid? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.
Thank you!
-BDP
Can I use this. I have a 2008 Nissan Sentra and lose a gallon of fluid every 33 miles.
Joyce-
Thank you for asking about your Nissan Sentra. Unfortunately, it sounds like you are losing fluid too quickly for the product to be of any help. The BlueDevil Transmission Sealer is intended for leaks that are seeping or lightly dripping, and you should typically be able to see results after about 100-200 miles of driving. Based on your description, you would lose the product before it got a chance to seal. A hard part repair may be your best option.
Thank you!
-BDP
Can this product be used to rejuvenate the rubber seal around a sunroof on a 2001 GM Cavalier. I used silicone oil once and RV rubber seal conditioner also to no avail. There is still a slight gap, but I don’t want to over swell and ruin it. Maybe one light application would help???
Robert-
Unfortunately, none of our products would work for the issue you’ve described. The product does not harden or thicken in anyway, so it would help rejuvenate rubber seals, however, it would not plug a hole or fill a gap.
Thank you!
-BDP
Would this work on my van that I was told (by the person selling it to me) has a front transmission seal leak? I haven’t driven it much in the 8 months I’ve owned it, but from time to time I have gone 2 – 4 miles at a time / 4 – 8 miles a day. The fluid appeared to last about a week under those conditions before I had to put more in so I’m assuming it’s not “pouring” out. I only ever saw a small area maybe 5″ diameter under the car when I parked.
Jen-
Based on your description, the BlueDevil Transmission Sealer should be able to seal the leak you’re experiencing. You will be using one oz. of the product per quart of fluid in the system, and should expect to start seeing results after approximately 100-200 miles of driving.
Thank you!
-BDP
I have a front seal leak and am losing about 4 quartz of trans fluid a week. Will this help?
Susan-
Unfortunately, it sounds as though you may be losing transmission fluid a little too quickly for the BlueDevil Transmission Sealer to be effective. The product is intended for leaks that are seeping or lightly dripping. Having the seal replaced may be your best option.
Thank you!
-BDP
Will this help w leaking oil out the front of a 03 WJ w the 42RE transmission. Think it’s leaking out the bell housing, possible torque converter seal is gone.
Ethan-
As long as the leak isn’t more than a seep or lightly dripping, the BlueDevil Transmission Stop Leak would be able to seal the leak you’ve described. You will add one oz. of the product per quart of fluid in the system. Expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
I have a Jaguar XJ6 that has been in storage for almost 20 years. On a gentle in-town test run of less than 5 miles, I lost transmission fluid down to the no-go point. A rescue bottle of less than a quart gave me about ¼ inch on the dipstick, which was enough to get me home. About 1 mile, still with ¼ inch on dipstick. Might this condition be treatable?
Eugene-
Thank you for asking about your Jaguar XJ6. The BlueDevil Transmission Sealer is intended for leaks that are seeping or lightly dripping. Based on your description, it would be tough to say what the fluid level was prior to your test run, making it difficult to estimate the size of the leak. As long as you keep the fluid topped off and are able to drive the vehicle without issue, the product may be able to seal your leak.
Thank you!
-BDP
I have a 1987 mercedez e300 and is leaking fro the front but only when i go reverse would this product help i might over filled the transmission
Cesar-
Thank you for asking about your Mercedes E300. Based on your description, you should first make sure the system has not been overfilled. Having too much/too little fluid in the system could cause the transmission not to function properly. If it appears you are leaking transmission fluid, we recommend using the BlueDevil Transmission Sealer. You should expect to see results after 100-200 miles of driving.
Thank you!
-BDP
I replace my transmission fluid every 5 days. Would this help my issue?
Alicia-
BlueDevil Transmission Sealer is intended for leaks that are seeping or lightly dripping. Based on your description, you may be losing fluid a little too quickly for the product to be successful. If you are losing fluid at a rapid rate, you would lose the product just as quickly, and wouldn’t really be able to keep it in the system long enough in order to get the benefit of using it. Having the seal replaced may be your best option.
Thank you!
-BDP
I recently changed my CV axle and transmission seal on driver side of my 2008 Santa Fe and have a small leak – Will this product help stop this leak?
Nick-
Thank you for asking about your Hyundai Santa Fe. Yes, the BlueDevil Transmission Sealer would be able to seal both of the leaks you’ve described. You will use one oz. of the product per quart of fluid in the system, and should expect to start seeing improvement after 100-200 miles of driving.
Thank you!
-BDP
Hello! I drive a 2007 Mazda3. I had a transmission leak and brought it to the shop – they told me the front seal needs to be replaced. The most that came out was about a 2 ounces worth after being parked for 5 minutes and it mostly comes out as droplets; it poured a small line once when in reverse. Is this leaking too much or would this sealant do the job? Thanks!
Alex-
Thank you for asking about your Mazda 3. As long as the leak isn’t more than seeping or lightly dripping, you would be a good candidate for the BlueDevil Transmission Sealer. You would use one oz. of the product per quart of fluid in the system. Expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
Hi there, I drive an 2010 Audi Q7 Tdi (Diesel). When I had the oil changed yesterday, they said I had a main seal leak. Would your product work?
P Prince-
Yes, the BlueDevil Rear Main Sealer is safe and compatible to use on your Audi Q7 Diesel. You should expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
I have a ck2 lancer an on the morning my first start the drive gear goes in an after that it dont goes in going up hill it stalls what causes that
Derien-
Your best bet may be to have the vehicle looked at by a certified mechanic. They should be able to pinpoint what is causing the shifting issues.
I have a 1996 ford van the front seal is leaking. When I drive it maybe 4 miles a day it doesn’t leak much but when I drive it maybe 10 miles it leaks a bit more. Will BlueDevil seal the leak if I don’t drive it much for a couple of days
Carol-
Thank you for asking about your Ford Van. The BlueDevil Transmission Sealer is intended for leaks that are seeping or lightly dripping, so as long as you aren’t losing fluid too quickly, you would be a good candidate for the product. Typically, it will be around 100-200 miles of driving before you start to see results. It does not have to be a continuous drive or a road trip. You are fine to drive the vehicle like you normally would.
Thank you!
-BDP
Will this be ok to use on my 2019 Chevy traverse? We just put a used transmission in it and looks to be leaking from the front pump seal. Really don’t want to pay to have it taken back apart. It’s a slow drip prolly about a quart a month.
Ryan-
Thank you for asking about your Chevy Traverse. Yes, the BlueDevil Transmission Sealer is safe and compatible to use for the application you’ve described. You will use one oz. of the product per quart of transmission fluid. Expect to start seeing results after 100-200 miles of driving.
Thank you!
-BDP
Is this safe for a CVT transnission
Danny-
Unfortunately, the BlueDevil Transmission Sealer is not intended for use in CVT transmissions.
Thank you!
-BDP
I have a 46re transmission with a leak, how much should I use for repair to take place. I’m about a quart low now.
Harold-
You would use one oz. of the BlueDevil Transmission Sealer per quart of fluid capacity. If you are a quart low, you could add the recommended amount of BlueDevil, and then top the system off with transmission fluid, being careful not to overfill the system.
Thank you!
-BDP