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…

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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.

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.

Fair Replacement Transmission Cost by Vehicle

  1. Use the Year / Make / Model lookup tool to determine what transmission your vehicle has.

  2. Find your transmission model in the table below for fair prices from reputable suppliers. Also fair labor cost for local installation at a local auto repair shop.

  3. Get a free estimate on a remanufactured transmission by email.

Fair Remanufactured Transmission Price Ranges by Transmission Model Updated July 2018

transmission repair cost
Download Replacement Transmission Cost Guide PDF

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36 thoughts on “Lucas Transmission Fix Review

  1. I just put 5 new selonoids in the outside of my transmission on a 2005 Impalia and it worked a month, then it didn’t shift like it should. I put this Lucas oil in it and it seems to be working. Will that oil start the new parts working better?

  2. I use this product in customers transmissions all the time. For trans that are slipping I add two bottles and charge for a full service. On cars that just need a fluid change I add one Lucas without servicing the trans, as it makes the fluid in the trans look clean. This product has made me a lot of money at my business. Thanks Lucas!!

  3. Taking 2002 Grand Cherokee and this Lucas
    Trans Fix can be added after Trans flush??
    Should it be added before trans fluid or after. My vehicle is great only has 82000 although I want to us it correctly

  4. I have a 1999 BMW with a lifetime transmission no dip to check fluid feels like it’s in park can rev rpms car just won’t go into any gear any suggestions? Besides the replacement of a transmission, that’s just not an option for me. Thanks in advance

  5. I have a 2007 toyota sienna that was starting to develop hard shifting and a little shudder between the 1-2 upshift. also had a problem when slowing down from average around town speed when stopping for a traffic light. if the light turned green before I came to a complete stop, the trans would act like it was in neutral for a second and then slam into gear hard. The van has 190,000 miles on it, and I am not going to spend the money to get the trans rebuilt. I was hesitant about putting an additive in it, but figured it couldnt hurt. I was concerned about overfilling, so I added 1/2 the bottle of lucas to see what would happen. Put the trans in neutral, and squeezed about half in. drove it home from the auto parts store, and the hard shifting, and banging into gear has completely resolved in less than 10 minutes from the addition of the bottle. excited to drive it some more later and see how the other issues are.

  6. so, If I understand this correctly, I should remove some transmission fluid to add lucas, my 2004 Toyota Tundra is full. What is the best way to do this?

  7. I have a Jeep wrangler 4 cylinder 2006 6 speed Manuel. 95000 miles it’s hard to get in reverse and 1st gear especially when cold Will Lucas transmission fix help it ??? Thanks Buck

  8. how much lucas engine stop leak do you put in an automatic transmission. I have
    a leaking transmission pan gasket. I tried this in my motor and it sealed up a leaking valve cover gasket. So I decided to put some in the tranny too. I just can’t see to find out anywhere how much to add

  9. I have a Toyota Sienna 2004 and earlier this year discovered water in the transmission. The oil was replaced but since then transmission not working optimally. Can Lucas help such situation where water entered into a transmission?

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