What Causes Transmission Slipping or Poor Shifting?

January 30, 2026 | By Mister Transmission

Common Causes of Transmission Slipping

Transmission slipping occurs when your vehicle has trouble staying in the correct gear or unexpectedly changes gears while driving. One of the most common causes is low, dirty, or degraded transmission fluid. Transmission fluid is essential for lubrication, cooling, and hydraulic pressure, and when it breaks down or leaks, proper gear engagement becomes difficult.

Mechanical Issues That Affect Transmission Performance

Worn or damaged internal components are another major cause of transmission slipping. These may include worn clutches, bands, gears, or seals that prevent the transmission from holding gears correctly. In manual transmissions, a worn clutch can cause slipping during acceleration, especially at higher speeds.

Overheating and Fluid Contamination

Excessive heat is extremely damaging to a transmission. Overheating can break down fluid and cause internal parts to warp or wear prematurely. Burnt or contaminated fluid often leads to delayed shifting, harsh gear changes, and slipping under load.

Electronic and Sensor-Related Problems

Modern transmissions rely on electronic controls and sensors to manage gear changes. Faulty solenoids, sensors, or software issues can cause poor shifting, hesitation, or slipping. A check engine light may appear when these problems are detected.

When to Seek Professional Help

At Mister Transmission St. Thomas, trained specialists use advanced diagnostics to identify the exact cause of transmission slipping and shifting issues. Addressing the problem early helps prevent major internal damage and costly repairs.

Why Early Diagnosis Matters

Ignoring slipping or shifting problems can quickly lead to complete transmission failure. Prompt inspection and repair help restore performance, improve safety, and extend the life of your transmission.

Mister Transmission Team

The Mister Transmission team consists of certified transmission specialists with decades of combined experience in diagnosing, repairing, and maintaining automatic and manual transmissions.

With over 60 years of service across Canada, our experts provide trusted, accurate, and up-to-date automotive advice to help drivers make informed decisions about their vehicles.

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Customer Reviews
This shop is great, they...
Dave In
This shop is great, they worked on my daughter's 2013 focus in 2017. When Ford would not honour their warranty. It is still going strong. I was told the transmission will out live the car. Well yes. It's time for a new veh with. Worked on my 2003 F150, great work, now my 2010, once again great work. They took time to find a miss, in the truck. I'm a car guy, and know shops that do great work. Yes everyone is never happy with the work. But for me there is always two sides.
Date: August 1, 2026
Website: Google
They got me in and...
Owen Findlay
They got me in and out fast, gave me good amount of knowledge and explained to me that my transmission seems to be fine and I’m just due for a service! Good people in there definitely give it a try!
Date: July 2, 2026
Website: Google
They communicated frequently about the...
Kim Masur
They communicated frequently about the progress with our vehicle. They were also able to accommodate us when our issue happened after they closed. Very appreciative of their service! Thank yo
Date: June 27, 2026
Website: Google
Had to get my transmission...
Aidan Hennebry
Had to get my transmission redone on my 2017 Dodge Grand Caravan at 140k clicks. Sucked. My local shop quoted me a little over $8,000 for the repair. I decided to call around. Mister Transmission gave me tons of information, answered my billion questions (even before I'd committed to becoming a customer), were prompt in getting my van dealt with, and even gave me better parts than my local shop had quoted me for... all for $6,500. How they did all of that for cheaper than my first quote I do not understand (other than the fact that: They are the only transmission shop in town, and all other shops would just bring transmission rebuilds over here). 10/10 would return to in the future (but hope not to have to). Can't recommend them enough. Mark and the gang: Thank you guys for the incredible service.
Date: June 23, 2026
Website: Google
Moved across country and seen...
Mourad Ja
Moved across country and seen a lot of shady mechanics been going here for a few times and they deserve this 5 star, very honest, knowledgeable and quick to resolve issues. Even with costs going up they are reasonably priced!! Thank you again G37
Date: June 22, 2026
Website: Google
Very expensive
Todd Bailey
Very expensive
Date: June 17, 2026
Website: Google
Thanks for helping with our...
Tammy Vink
Thanks for helping with our daughter’s car! Your team was super kind and we really appreciate the options for moving forward.
Date: June 11, 2026
Website: Google
Amazing service and quality. Mark...
Tran Linh
Amazing service and quality. Mark is the best!
Date: June 11, 2026
Website: Google
I’m very pleased with my...
Denielle Tooley
I’m very pleased with my experience at this shop! I brought my beloved Mustang here for a transmission rebuild. They were very helpful in explaining the process to me, communicating with the warranty company on my behalf, and keeping me updated on timelines without me having to ask for updates. I was delighted to pick up my vehicle and see they had gone above and beyond by washing it and putting some gas in it! All the staff I spoke to were pleasant and easy to work with. Mark took the time to explain things to me and ensured my full understanding throughout the process. I was encouraged to come back in about a week and a half for a final check up/inspection at no cost, which makes me feel even better about their confidence in their work.
Date: June 5, 2026
Website: Google
I'll return to this mechanic....
Lisset Acuña
I'll return to this mechanic. He is honest and straight up to the point. Awesome service!
Date: June 5, 2026
Website: Google
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