If you’ve ever experienced slipping, stalling, hard shifts, or seal leaks with your car’s transmission before, there’s no doubt you’ve already heard of Lucas Transmission Fix. As the name implies, this additive is meant to help fix an ailing transmission that displays any of the above symptoms. Often called a “miracle in a can”, this is actually not always the case. If your transmission has major internal problems already, Lucas can’t magically repair it. This additive works within reason, such as for a transmission that has a clogged valve body or worn seals. But what does it actually do and does it deliver on the intended results? We’ll go over as much as possible today in our Lucas Transmission Fix review.

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What Does Lucas Transmission Fix Do?

• Stops transmission slipping, rough shifting, and hesitations
• Eliminates most seal leaks
• Non-solvent formula (helps to prevent seal wear)
• Can be added to existing fluid without draining any out

How Does Lucas Transmission Fix Work?

Transmission slipping, rough shifting, and hesitations

Slipping, rough shifting, and hesitations are often caused by a clogged valve body, worn transmission bands, or worn clutch plates. Lucas’s blend of friction modifiers and additives helps to renew transmission bands, improve friction between clutch plates, and remove any varnish buildup in the valve body. This helps to smooth out shifting and allows transmission bands and clutch plates to engage gears properly.

Seal leaks

Seals are supposed to be soft and leak-proof, but over time they can crack and harden, which results in fluid being able to escape. Adding an additive like Lucas helps to soften them up again while also expanding them to cover a larger area.

Non-solvent formula

A very important thing to look for in any transmission fluid additive is that they don’t contain any solvents. Solvents decrease ATF’s lubrication properties and causes seals to wear out more quickly, which can result in both a higher chance of leaks as well as higher fluid temperatures (overheating). Since Lucas contains no solvents, this makes it perfectly safe to use with your transmission.

Adding to existing transmission fluid

What most people notice when they use Lucas Transmission Fix is that it’s very thick right out of the bottle. This is because the blend of friction modifiers and other additives are supposed to dissolve into your existing transmission fluid while warm, so you don’t have to bother with draining any fluid out.

Who Is This For?

Lucas Transmission Fix is a good idea if you’re experiencing transmission slipping, rough shifting, stalling, or seal leaks, and want to try a cheaper option before you resort to a repair shop. A twenty buck product is definitely a better alternative than getting a repair that can cost hundreds of dollars. In most cases, this stuff works as long as the problems aren’t too heavy. With any automotive problem though, the key is to address the issue quickly before it gets too large for you to handle. But in the case of Lucas Transmission Fix, this additive works better in cases of hard shifts and slipping, since it’s a very viscous blend of friction modifiers that thickens ATF. This helps to improve fluid pressure which smooths out shifting and helps clutch plates engage more efficiently.

For very serious cases of slipping, stalling, or leaks, this can be used in the meantime until you’re able to bring it in for repairs or if you want to squeeze some extra miles out of a transmission on its last leg. Sometimes, just a little extra time is desperately needed and that’s where Lucas Transmission Fix can help. This is really meant as a short term solution though, since a transmission with damaged internal parts can’t be fixed with a simple fluid additive.

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Note: Some people might recommend adding a bottle of Lucas Transmission Fix to the transmission after a fluid change but if you’re looking for preventative maintenance and long term transmission care, then I recommend a different product, which is Lubegard Automatic Transmission Protectant. This stuff helps to reduce transmission operating temperatures, optimize performance, eliminate noise, extend fluid life, and is compatible with all automatic transmission fluids. So if you routinely change your fluid or if the fluid is new, then this would be the better fit for long term benefits.

Similar Alternatives

• Motor Medic Trans Medic AT Treatment & Shift Improver
• ATP AT-205 Re-Seal Stop Leaks
• CRC Trans-X Slip-Stop Leak-Fix
• Sea Foam TT-16 Trans Tune Transmission Additive

How to Use Lucas Transmission Fix

1). Although the instructions say that you can add Lucas Transmission Fix to existing transmission fluid, I recommend checking the fluid levels first to make sure you won’t overfill. If fluid levels are relatively high, you can remove the appropriate amount of ATF that corresponds to how much Lucas you want to add. So if you’re going to add a whole bottle of Lucas (24 ounces) then 24 ounces of transmission fluid should be removed. This can be done by loosening a few bolts on the transmission pan and having some of the fluid drained out and then re-tightening them.

2). You’ll then need to warm up your engine and transmission to operating temperatures. Have your car idling for at least 20-30 minutes before you add the additive. That’s because Lucas is really thick and will only sink to the bottom of the pan if not properly dissolved.

3). Open your vehicle’s hood and locate the transmission dipstick. You might want to look online or in your owner’s manual to find the exact location. Remove the dipstick and add a funnel in its place.

4). Add the amount of Lucas Transmission Fix you want slowly through the funnel until all of it has disappeared. Although one bottle is enough for most cars, two might be necessary for larger cars or badly worn transmissions while 12 ounces is enough for most sub-compact and compact vehicles. You can then re-insert the transmission dipstick and close the hood.

5). To make sure all the additive has properly dissolved, drive your vehicle around for awhile and shift through all the different gears. Effects should be immediate.

Final Thoughts

All in all, if you have a transmission that stalls, slips, has difficulty shifting, or has seal leaks, Lucas Transmission Fix is definitely worth a shot. Compared to how much you’d have to pay for a repair, Lucas Transmission Fix can be a cost effective solution for a problematic transmission. Does it work? It usually does, as long as the issue is caused by the common symptoms of slipping, hard shifting, and seal leaks and it hasn’t become too serious.

The biggest problem we see is that you can’t truly diagnose what’s causing your transmission to malfunction, so using this product is a hit-or-miss kind of deal. There’s no guarantee that it will fix a transmission with slipping, hard shifts, or seal leaks, but even if it doesn’t completely solve the problem, it can still buy you valuable time until you’re able to get your car into the shop. And if it doesn’t show any positive results, draining and replacing the transmission fluid a few times will remove all of the additive.

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