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Dura-Seal® offers a variety of transmission sealer products which are safe and easy to use. Our transmission sealers and additives can save you thousands of dollars in repair costs and can withstand the high temperatures which are present within your vehicle's transmission for years. These products are non-solvent based formulas and contain no silicates so their compatible with all automatic transmissions and cannot cause clogging or damage. Dura-Seal® transmission sealers and additives cannot void your vehicle's warranty. Our sealers and additives are easy to use and are simply added to your transmission fluid.


Why don't mechanics tell us about this stuff? My mechanic was going to charge me 1400 bucks to replace my transmission in my honda civic. I almost let him but before I took it to him I bought your transmission shutter stop and used it. It only took about 2 days for it to stop my car from jumping in and out of gear. I'm so happy I've been telling all my friends about your stuff.

Used your transmission stop leak on my 88 camary. It really worked. Thanks...
Linda - WA.

My car was shaking so bad the cops actually pulled me over! Tried your Shutter Stop and in about 30 minutes it really started to smooth out. No more shaking after about 110 miles of driving!!! Cool stuff...
Mike - VA.

Great product! My transmission lost reverse gear! It was actually embarrassing, I's have to push my car back out of a parking space just to be able to drive off! My mechanic said it would be over 2800 dollars to do the rebuild. I don't have the money for that so I tried your Shift Restore and wow it WORKED! Thanks guys...
Sally - NC.


Your transmission stop leak is great! I used it in my 6 cylinder Mustang. It was blowing transmission fluid all over the under side of my car and smelled like burning oil. I used your stop leak and within about 2 days smoke totally stopped. In about 75 miles it wasn't losing fluid anymore. You really make a good product. Now I'm gonna sell it. LOL...
Maria - CA.

My mechanic said your transmission stop leak wouldn't work but I didn't have the money to get the transmission replaced so I used your product anyway. Well, I was so happy when it actually worked that I went back to my mechanic and said your fired! You guys really saved me cause I need this van to pick up and drop off my kids at school. Thanks!
Shelly - GA.

Why don't mechanics tell us about this stuff? My mechanic was going to charge me 1400 bucks to replace my transmission in my honda civic. I almost let him but before I took it to him I bought your transmission shutter stop and used it. It only took about 2 days for it to stop my car from jumping in and out of gear. I'm so happy I've been telling all my friends about your stuff.

Used your transmission stop leak on my 88 camary. It really worked. Thanks...
Linda - WA.

My car was shaking so bad the cops actually pulled me over! Tried your Shutter Stop and in about 30 minutes it really started to smooth out. No more shaking after about 110 miles of driving!!! Cool stuff...
Mike - VA.

Great product! My transmission lost reverse gear! It was actually embarrassing, I's have to push my car back out of a parking space just to be able to drive off! My mechanic said it would be over 2800 dollars to do the rebuild. I don't have the money for that so I tried your Shift Restore and wow it WORKED! Thanks guys...
Sally - NC.


Your transmission stop leak is great! I used it in my 6 cylinder Mustang. It was blowing transmission fluid all over the under side of my car and smelled like burning oil. I used your stop leak and within about 2 days smoke totally stopped. In about 75 miles it wasn't losing fluid anymore. You really make a good product. Now I'm gonna sell it. LOL...
Maria - CA.

My mechanic said your transmission stop leak wouldn't work but I didn't have the money to get the transmission replaced so I used your product anyway. Well, I was so happy when it actually worked that I went back to my mechanic and said your fired! You guys really saved me cause I need this van to pick up and drop off my kids at school. Thanks!
Shelly - GA.

Why don't mechanics tell us about this stuff? My mechanic was going to charge me 1400 bucks to replace my transmission in my honda civic. I almost let him but before I took it to him I bought your transmission shutter stop and used it. It only took about 2 days for it to stop my car from jumping in and out of gear. I'm so happy I've been telling all my friends about your stuff.

Used your transmission stop leak on my 88 camary. It really worked. Thanks...
Linda - WA.

My car was shaking so bad the cops actually pulled me over! Tried your Shutter Stop and in about 30 minutes it really started to smooth out. No more shaking after about 110 miles of driving!!! Cool stuff...
Mike - VA.

Great product! My transmission lost reverse gear! It was actually embarrassing, I's have to push my car back out of a parking space just to be able to drive off! My mechanic said it would be over 2800 dollars to do the rebuild. I don't have the money for that so I tried your Shift Restore and wow it WORKED! Thanks guys...
Sally - NC.


Your transmission stop leak is great! I used it in my 6 cylinder Mustang. It was blowing transmission fluid all over the under side of my car and smelled like burning oil. I used your stop leak and within about 2 days smoke totally stopped. In about 75 miles it wasn't losing fluid anymore. You really make a good product. Now I'm gonna sell it. LOL...
Maria - CA.

My mechanic said your transmission stop leak wouldn't work but I didn't have the money to get the transmission replaced so I used your product anyway. Well, I was so happy when it actually worked that I went back to my mechanic and said your fired! You guys really saved me cause I need this van to pick up and drop off my kids at school. Thanks!
Shelly - GA.

Why don't mechanics tell us about this stuff? My mechanic was going to charge me 1400 bucks to replace my transmission in my honda civic. I almost let him but before I took it to him I bought your transmission shutter stop and used it. It only took about 2 days for it to stop my car from jumping in and out of gear. I'm so happy I've been telling all my friends about your stuff.

Used your transmission stop leak on my 88 camary. It really worked. Thanks...
Linda - WA.

My car was shaking so bad the cops actually pulled me over! Tried your Shutter Stop and in about 30 minutes it really started to smooth out. No more shaking after about 110 miles of driving!!! Cool stuff...
Mike - VA.

Great product! My transmission lost reverse gear! It was actually embarrassing, I's have to push my car back out of a parking space just to be able to drive off! My mechanic said it would be over 2800 dollars to do the rebuild. I don't have the money for that so I tried your Shift Restore and wow it WORKED! Thanks guys...
Sally - NC.


Your transmission stop leak is great! I used it in my 6 cylinder Mustang. It was blowing transmission fluid all over the under side of my car and smelled like burning oil. I used your stop leak and within about 2 days smoke totally stopped. In about 75 miles it wasn't losing fluid anymore. You really make a good product. Now I'm gonna sell it. LOL...
Maria - CA.

My mechanic said your transmission stop leak wouldn't work but I didn't have the money to get the transmission replaced so I used your product anyway. Well, I was so happy when it actually worked that I went back to my mechanic and said your fired! You guys really saved me cause I need this van to pick up and drop off my kids at school. Thanks!
Shelly - GA.


8oz. Concentrated Bottle
(may differ from picture)
8oz. Concentrated Bottle
(may differ from picture)
8oz. Concentrated Bottle
(may differ from picture)
Pro-Grade!
Works Fast in
150 miles or less...

Dura-Seal® Transmission Shutter-Stop
Custom mixed for all 4 to 8 engines. Dura-Seal® Hi-Strength Transmission Shutter-Stop stops all jerky shifts, torque converter lock-up shudder, hard gear shifts, trans-noise. Will not clog system... Easy pour-n-go formula! Last up to 5 years!
Dura-Seal® Transmission Shift-Restore
Custom mixed for all 4 to 8 engines. Dura-Seal® Hi-Strength Transmission Shift-Restore restores lost gears, restores "Reverse" ,"First Gear" and "Overdive" in old and worn transmissions. Will not clog system... Easy pour-n-go formula! Last up to 5 years!
Hi-Strength!
Works Fast in
125 miles or less...

Pro-Grade!
Works Fast in
150 miles or less...

Dura-Seal® Transmission Stop Leak
Custom mixed for all 4 to 8 engines. Dura-Seal® Hi-Strength Transmission Stop-Leak is 45% stronger than store-brands! Able to stop leaks "store-brands" can't even slow down... Will not clog system... Easy pour-n-go formula! Last up to 5 years!
Regular price:$49.99
Sale Price Today: $39.99 (+S/H)
Regular price:$49.99
Sale Price Today: $39.99 (+S/H)
Regular price:$49.99
Sale Price Today: $39.99 (+S/H)
Non-Thickening Formula! Will cause seals to expand to their original size by re-impregnating them with silicone stopping the leak!
6 Cyl Size: $49.99 (+ S/H)
8 Cyl Size: $59.99 (+S/H)
ON SALE: $69.99
OBDII & CAN ready!
Reads engine codes! Turn-off Trouble Lights, reset codes!

Buy Now
Buy Now
Buy Now
4 Cyl Size: $39.99 (+ S/H)
Ships FREE
Today!

No side-effects. Works with all types of engine oil including Synthetic oil and diesel Rottella oil.. Last up to 5 years.
ON SALE: $29.99
Made by Dura-Seal® to contain 25% more real carnauba wax then any store brand! Spray-on, Wipeoff...
ON SALE TODAY: $39.99
Buy Now
Buy Now
Ships FREE
Today!

Includes:  Restorer-Gel,
DuraSeal Plastic Selaer,
Buffingwheel and
micro fiber towel...
Works Great!
Same Formula the Professional Repair Shops Use! Removes scratches, discoloration, yellow spots, white spots and other imperfections from lenses...
Pro-Grade
Repair!

Transmission Fluid Leaking:
Automatic transmission fluid is vital to your car's shifting capabilities, so a little fluid on your driveway can quickly turn into a major problem. Automatic transmission fluid is bright red or can be clear in some newer vehicles and a little sweet-smelling when everything's working correctly. When you check your automatic transmission fluid, make sure it's not a dark color and that it doesn't have a burnt smell. If you notice a leaking fluid under your vehicle or smell burning transmission fluid, then you should use Dura-Seal Transmission Stop-Leak to cure the leak.


Transmission "jerking" or "shuttering":
This can occur while driving in a steady gear or during shifting. For automatic transmissions problems, you'll most likely feel the car shimmy into each gear rather than the typical almost unnoticeable shifts, or the transmission will make a jarring transition into the next gear. Sometimes the transmission will cause the entire vehicle to shutter or jerk forward and backward. These are all signs that your transmission needs attention. If you notice a shutter or any of the symptoms listed above, then you should use Dura-Seal Shutter-Stop to cure the problem.


1st. Gear, "Reverse" or "Overdrive" not engaging:
It's difficult to nail down exactly how your car may sound or feel if there's transmission trouble, but one thing's pretty certain, you'll probably get a "that-doesn't-feel-right" feeling when you put your vehicle into gear and accelerate but nothing happens! If your vehicle shifts into a higher or lower gear when cruising at a steady speed (not accelerating or decelerating) or you have actually lost a gear like; 1st gear, reverse or overdrive, Dura-Seal Shift-Restore to cure the problem.

Still have questions? Need more help..? Call Us: Mon-Fri. 9am to 5pm. EST 706-633-9088
Don't know which transmission product you need? Read below...
Dura-Seal® provides you with a Free Replacement Warranty on all Transmission Additives & Oil Stop-leaks in case you need more sealer to then typical to achieve a full-seal, (*certain conditions like S/H may apply, see Terms). 98% of customers achieve a "full-seal" on the first application. Only 2% will require a second application to achieve a "full-seal". So if you don't get a full seal, call us and we'll send you another free application to get you to the finish line...

(Legal Notice: Other brand names not affiliated with Dura-Seal® and listed within this portal are factious and not related to any company, manufacturer, and/or corporation know past or present:)
Customer Servcie: 706-994-8466      Tech Dept: 706-633-9088
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