BlueDevil Products00236 Transmission Sealer - 16 Ounce

Had transmission leak after I took my 1974 Corvette Stingray on a trip for Easter Sunday. Was quiet a bit of fluid on the driveway. I added 3 ounces of this product, drove the car about 100 miles and there is not 1 single drip on the driveway after several trips. Highly recommend!

Transmission started leaking about 2 weeks ago. Wife called me and said there is oil on the garage floor after Ieft. Cleaned it up. The next morning there was oil on the floor again. After investigating I realized it was transmission fluid. Went to Amazon to see if there was anything available to stop the leak. There was several options, seemed like the Blue Devil had the best reviews so I ordered. Took a few days to get it. By the time I got it car was leaking a lot. My car holds 12 quarts of fluid so per recommendation I put 12 oz of Blue Devil in. I then topped of the transmission with 5 quarts of Transmission fluid. So in 2 weeks I had lost about 6 quarts of fluid, so quite the leak. Had my doubts but after driving several hundred miles it looks like the leak has completely stopped. Now if it holds up I will be amazed.

I used exactly 2 ounces and put it in my leaking Ford F-150 5 Speed Mazda transmission. It was leaking out of the 3 plugs on top of the transmission. I didn't want to take out the seat, pull back the carpet, remove the tunnel, then remove the top of the transmission to put in new plugs this close to deer season, so I decided to give BlueDevil a try. After a couple days THE LEAK STOPPED!!! No more drips!! The transmission sounds the same, shifts the same and works the same, other that it stopping the leak that is. I recommend BlueDevil Products 00236 Transmission Sealer.

While it's been less than a week since added to leaky 30 yo trans, no sign of leakage yet.

Well shortly after adding this product my transmission started acting up. Mostly the reverse would shake the entire vehicle and not get into gear. Just got a call from the shop and his first question - did you use an additive? I say yes and he says that the additive swelled all the rubber in the transmission to more than double their original size, causing the issues. Total $4000 to fix what this $13 bottle of pure junk did. Reaching out to the company to ask if they have any guarantees....not expecting much. Do NOT use this product, you've been warned...

My 1986 Suburban had a bad drip from the transmission, I'd lose about a quart every 200 miles. It was likely the front seal which a shop quoted me over $1000 to replace so figured I'd give this stuff a try and it actually worked! Put a piece of cardboard under my truck and after two weeks there's only three drops when befo addedre the cardboard would've had a large spot. I warmed my truck up, shut it off, added the whole bottle and drove 100 miles to go camping. The next day, drove 100 miles home and the leak has slowed to almost nothing!

Did not work for me. I applied it to a Allison 1000 and it clogged up my pressure switch and had to replace valve body.

I have an old 2002 zr2 blazer and I replaced the trans filter , gasket and fluid. I torqued everything to spec and couldn’t get a drip to stop . I put this in and within a day bone dry. This worked great for me and my situation. I also used the rear main seal in this old trail / woods truck and that worked just as great . Not sure about everyone else but this Blue Devil stuff worked in my trans and my rear main seal. Great stuff !