Sealing a Front Seal Transmission Leak

front seal transmission leakTransmission 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.  
BlueDevil Transmission Sealer


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

12 responses to “Sealing a Front Seal Transmission Leak

    1. 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!


  1. I had someone replace my transmission without changing the seal. The fluid is pouring out…. will this product work.

    1. 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!


  2. 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?

    1. 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!


    1. 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!


  3. 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???

    1. 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!


  4. 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.

    1. 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!


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