Lucas Transmission Fix Review

An automatic transmission can be quite costly to repair, which is why there are so many transmission additives on the market today. One of the most popular brands is Lucas Transmission Fix, and if you’ve ever had transmission problems, you’ve probably heard of it. It claims to fix transmission slipping, hard shifting, transmission leaks, and stalling. But does it work? Let’s find out…

What is Lucas Transmission Fix?

LucasLucas Transmission Fix Transmission Fix is a non-solvent transmission additive that contains a blend of friction modifiers and other petroleum-extracted additives. What this means is, the non-solvent formula will not harm any of the seals or internal components inside your transmission over time. The additives are specially designed to help reduce the effects of worn transmission components. This product won’t completely fix a broken transmission, but it will help the transmission operate properly – and for under $10.

What does it do?

Reduces slipping, rough shifting, and hesitation
Lucas Transmission Fix is designed for automatic transmissions that slip out of gear, experience hard shifts (they sort of “bang” into gear), or transmissions that seem to hesitate to engage (go into) gears. These problems often develop over time, and can be attributed to worn transmission bands, worn clutches, and clogged valve bodies.

To smooth out gear engagement/shifting, this additive contains friction modifiers that can improve the grip between the clutch plates inside the transmission, and the lockup clutch inside the torque converter. The proprietary formula also creates a polymeric film on the transmission bands to reduce slipping. And, special additives also help to remove sludge and varnish from inside the transmission valve body, which can significantly help up-shift/down-shift operation.

Stops transmission seal leaks
Transmission seals can harden over time, which reduces their ability to withstand fluid pressure – allowing ATF to leak out. Lucas contains special chemicals that are designed to soften seals, which can help prevent leaks from occurring.

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How to Use Lucas Transmission Fix

For best results, have your transmission oil and filter changed before adding Lucas. However, you can add it to your existing transmission fluid by simply removing the transmission dipstick and using a funnel to pour it in.

The instructions say you can add it in without removing any transmission fluid, but you need to check the level on the dipstick (with the vehicle running) to ensure that you are not going to overfill the transmission. If the fluid is already at the full mark, you should remove some first to make enough space for the Lucas. Search online or check your owner’s manual if you’re having trouble locating the dipstick.

It’s best to drive around for at least 15 minutes or so before introducing this additive so that your engine and transmission are warm and up to operating temperatures. Lucas Transmission Fix is a very thick liquid, and its friction modifiers and additives are designed to dissolve into the transmission fluid as it heats up. After adding it to your transmission, you should drive around for 15 – 20 minutes in order for it to fully blend with the existing fluid. You should notice the effects almost immediately.

One bottle of Lucas is enough for most cars, but if your vehicle is large or the transmission is in very poor condition, you might need two.

If you’re unhappy with Lucas Transmission Fix, you can change your transmission fluid and filter to remove it from your vehicle completely. Since it contains no solvents, it cannot harm any of the transmission’s internal components.

Final thoughts

Lucas Oil has been making automotive additives for many years. They are well respected throughout the auto industry, and it’s uncommon to find anybody who has experienced negative effects from using their products.

It’s important to understand that a transmission additive like Lucas is not the end-all solution to your transmission problems. That said, it can reduce the severity of most symptoms and keep a transmission running longer. Mileage and how you drive can wear down a transmission’s internal components, and the only permanent solution is to fix, rebuild or replace the transmission.

I have personally seen this product reduce transmission hesitation and slippage on high mileage vehicles and since it is not a solvent, it can be used with little chance of negative effects.

The positive benefits are easier to see on older vehicles with worn transmissions. The additives in Lucas Transmission Fix do seem to improve gear engagement, but stopping transmission leaks tends to be hit or miss (it really depends on the severity of the leak).

The bottom line is, Lucas can help with problems normally associated with worn, high mileage transmissions. This will hopefully keep you on the road until you can afford to have the transmission properly repaired. This product isn’t a permanent solution, but it can work well as a temporary fix.

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18 thoughts on “Lucas Transmission Fix Review

  1. I have a 2000 chevy 1500 with 240000 miles on it.I have changed my fluid and filter every 10000 miles. I use lucas tranny fliud and i add a bottle of lucas trans fix at every change. Trans shifts better now than it did when it was new. I also have a 2005 yukon with 180000 miles on it and i have done the same thing to it.Just sold a 1997 olds 88 with 200000 miles on it and it was done the same way,NO PROBLEM at all on none of my cars. I will use this stuff in all of my cars from now on,also works great in a manuel trans too

  2. Just bought a new Jeep Grand Cherokee. Only a few hundred miles on it. No problems yet.
    Would Lucas work as a preventative measure?

  3. The transmission of my 2000 GMC Savana cargo van started slipping in the spring of 2016, so I started shopping for a new truck. By the end of the summer I couldn’t get the transmission to shift into 3rd gear, or reverse. My mechanic told me to use the Lucas Transmission Fix. After a few days the transmission was back to normal. I was able to go in reverse! This is an amazing product

  4. 1993 dodge Dakota left in field over a year picked it up for free great price 114000 miles was told trans smoked dumped all fluids used Lucas in trans and oil both products worked fantastic now the previous owner won’t talk to me said wtf that truck never ran so good .note once you add the juice give the vichicle a solid run about 40 miles

  5. I’m just curious how effective it is specifically on a slipping transmission ? I have an 03 kia Rio. So obviously, I can’t spend any significant money to fix/ rebbuild/replace the tranny. ( and before anyone mentions it, no my tranny is NOT the infamous Mitsubishi 1600 that has the notorious slipping issue but surprisingly simple and comparatively inexpensive fix — why, I have no fu%#ing
    idea) In any case, the question is how effective is the Lucas additive at tackling a tranny that wants to slip in higher gears? I can only drive in 1st and 2nd gears. So basically, I can only go about 35 miles an hour, and even that speed tachs me up to 4000 rpm. If I could limp along for 2 or 3 months with the additive, I would be ecstatic. Thank you for any comments!

  6. I have a 1999 Ford Explorer Sport with 190.000. Transmission started slipping and I added 2 bottles of this product and never slipped again. The transmission works like new! Thank you Lucas!

  7. 2000 Toyota Corolla Automatic transmission developed a leak around 165K. I kept it full of fluid but it was 1/4 bottle of ATF every 360 Miles or so, this was starting to get expensive, I was thinking about replacing trans gaskets. Money is always an issue so that fix was looming large. My father told me about Lucas…I asked a few mechanics that I know and they all said to be careful, but since the car is high miles, and I’m not likely to keep it forever, go ahead. I added 10 oz as per the directions, refilled the trans fluid to hot full mark. Leak stopped instantly. Trans seems to pull a little better and my MPG went from 36 MPG highway to 37.5 to 38 ish…This may not work on all problems, but it worked on mine. I still watch the fluid, but I haven’t had to add any yet and I’m at 175,000 and counting. I have no problems with this being my 164 Mile round trip commuter car.

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