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…

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

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.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

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john s
1 month ago

slow getting in to top gear

David B Brooks
1 month ago

It drops into low and won’t shift just drives in low ,starts out good after ten miles it start shifting itself into low gear.

2 months ago

occasional very hard shifting between neutral – drive- reverse. Having watched videos saying how thick and hard to pour, I put the lube container in 150* temp water for 6 minutes. After which it flowed fairly easily

Last edited 2 months ago by RobH
3 months ago

Sluggish shifting

4 months ago

2008 impala 3.5. When take off from stop car seems to slip then bang into gear. Only happens between 1st and 2nd gear. Changed fluid and filter and still happens. Any advice would be very helpful

R. Burrito
6 months ago

2005 Toyota Sienna with 200k started to shudder and hesitate in the lower gears. Put in a bottle of Lucas and vehicle is running like a champ. I did drain equal (24oz)tranny fluid otherwise I would have been over. I love u Lucas!

7 months ago

Question: Why Does Lucas Transmission Fix Come In a” Completely” WHITE 24 OZ. Container. Therefore no way of knowing how much is being poured into dip stick tube very slowly with warm engine running.Low to begin with, Constantly checked with dipstick,didn’t even use much but dripped over night.!

Richard Allsbrook
7 months ago


7 months ago

1992 GMC Sierra C1500 – 700r4 transmission 2 WD it stopped engaging 3rd and OD gears while driving on the highway right after i floored it. i continuing driving on 3rd gear for approximately for 25 miles. Got home and checked the oil stick it was dirty and low on fluid. Added 2 bottles of Lucas fix and some transmission fluid. It still does not goes to pass 3rd gear. Checked the governor and it was stuck so I cleaned it and now the valve not sticking. It still not working. Do I need to reset the computer? What should I do next? Should I give it a transmission fluid and filter change?

Last edited 7 months ago by Rich
JR Camien
7 months ago

2002 Dodge Ram 1500 1/2ton 4.7L 4wheel drive. Needing to find out where to go to find out the type transmission

10 months ago

My seal on my transmission is leaking on my 1979 Chevy C10 will this product help

5 months ago
Reply to  Santiago

Replacing the seal will help👌💯

10 months ago

CVT is a big ? Not good for cvt

4 months ago
Reply to  Will

I actually used this on my 11 year old maxima with a cvt. And it helped it tremendously! I did that like 6 months ago and haven’t had any more issues. Who knows how long it will last though.

1 year ago

I have a 2008 Scion xB with 240,000 miles. It’s a quirky car (as far as the automatic shifting noises, and noises in general), but recently it started acting really bad- heavy downshift clunk when coming to a stop, slippage going into 3rd gear, gear grinding around 38-41 mph (it’s done that for over 4 years)… Long story short, we put Lucas in it and it has been driving like a different car. No clunks, grinds or slipping. I’ve been car shopping for a few days and I think I’ll hold off a little longer (haha! I’m a tightwad with money). It’s only been a couple of days, but so far it’s a thumbs up from me!

Kd lawrence
1 year ago

i have a 2008 infiniti g35 its at 253k miles and engine still runs great, my transmission just slips from 1st to 2nd gear, after that, all other gears are smooth. Will lucas transmission fix help it stop slipping?

1 year ago
Reply to  Kd lawrence

I had the same issue with my 2008 Ford escape, put half the bottle in still slipped just less often put the rest and it’s been smooth. Its amazing let’s see for how long

1 year ago

We put this in our 1999 ford ranger…wish we never had 2 days later whole tranmission went …we do not recommend this crap at all ! Waste of money and cost us more !

1 year ago
Reply to  W&H

Yeah, because it was fine when you added the Lucas right? This product works wonders if used in the right case. Obviously your transmission was screwed to begin with and you were going to replace it either way so it didn’t cost you any more than the bottle of Lucas. Dont blame them for your stupidity!

1 year ago
Reply to  W&H

Why did you put it in your transmission in the first place? Could it be your transmission was just about to die? Oh yea thats right…. and then it did.

10 months ago
Reply to  W&H

The Detergents in the Lukas may have broken down some debris in the tranny and then caused a plug in the valve body. Changing the fluid and adding additives can actually be risky if it was not done at manufacturers recommended mileage.

9 months ago
Reply to  W&H

Hey your transmission was going regardless. Thinking that adding a 12 dollar bottle of additive was going to fix it was your mistake not the products. I’ve been working on cars and trucks for 30 years. I know those who have and used myself this product hundreds if not over a thousand times and 99% of the time it has helped that other 1% has nothing to do with the product but with the user such as yourself. Sorry to be so blunt but you are doing a disservice to many who would greatly benefit from using this product.

Christophe Mattice
1 month ago
Reply to  W&H

Same thing. But it also happened about 15 minutes later

1 year ago

I had a 1996 dodge ram 1500 4×4 that was slipping in all gears including reverse and a jug of Lucas stopped the slipping completely and ran for a few years longer with no problems until sold.

1 year ago
Reply to  Gary

Let me guess, the ad claimed “lady driven, shifts like butter, runs mint”

Frank Kern
1 year ago

I have no slipping issues, and my transmission is strong. Small leak has developed (quarter size spot). Do you recommend this product for my situation?

John gm master tech
1 year ago

I’ve done trans services on my Yukon since 50 k and at 200 k I put this in and I have the lowest hiway rpms at 70 mph ever 1800 and it’s always been 2000 200 reduction is impressive

1 year ago

My 2008 dodge avenger takes 4 qts of transmission fluid can i Add 24 oz of lucas to it or should i even it out

Sum gai
1 year ago
Reply to  Shawn

Even it out

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