Transmission Repair & Service St. Thomas, Ontario

Pinpointing the exact cause of any transmission problem takes skill, knowledge, and investigation

The evolution of transmissions has made these machines and systems increasingly complex. When transmission repairs are required, determining the cause and cure for what ails can be tricky. Why? Because transmissions have become remarkably complex and computerized and that presents both advantages and disadvantages. On one hand, transmission performance has become noticeably better in all vehicle makes and models. On the other, the increased complexity and digitization of transmission systems has made repair work a highly technical and complicated affair.


As you can imagine, there are different types of transmission repair jobs and options you can choose from depending on the nature of your vehicle’s breakdown. Understanding what those options are can help you make informed decisions when faced with a choice of transmission repairs to weigh.

A Repair for Every Type of Transmission Malfunction

Some transmission repair work is straightforward and mechanical in nature. Other times, it’s a combination of mechanical and electronic engineering that’s required to get your car back on the road. The most common types of repair work include:

  • Adjustments and in-car repairs. Most minor repairs are simple matters that are done without removing the transmission from the vehicle. If yours is a computer-controlled transmission that is not shifting properly, it is often the result of a computer sending incorrect signals due to a faulty sensor, or the transmission is not reacting to the command because of a bad connection or defective solenoid pack. If a non-computer controlled transmission is shifting too early or too late, it may require an adjustment to the throttle cable. If the vehicle has a vacuum modulator instead of a throttle cable, there is an adjustment that can be made using an adjustment screw in some designs. In vehicles with modulators, however, it is important to ensure there are no vacuum leaks and that the engine is running at peak efficiency.
  • Reseal jobs. A transmission is re-sealed to repair external transmission fluid leaks. If you see spots of red oil on the ground under the car, your transmission may need a re-seal job. To check a transmission for leaks, a technician will put the vehicle on a lift and examine the unit for signs of oil leaks. If a leak is spotted at any of the external seals or gaskets and the transmission otherwise performs well, the technician will most likely recommend that the transmission be re-sealed. Most of the external seals can be replaced while the transmission is still in the car but, if the front seal must be replaced, the transmission must first be removed from the vehicle to gain access to it.
  • Replacing accessible parts. There are a number of parts that are accessible without requiring the removal of the complete transmission. The parts that are accessible, however, vary from transmission to transmission and most transmission repair facilities would hesitate to provide meaningful warranties on external repairs for the simple reason that they cannot see if there are any additional internal problems in the components that are only accessible by transmission removal.
  • Complete overhauls. Also known as “rebuilding a transmission”, a complete overhaul involves the removal and disassembly of the transmission in its entirety. Every part is inspected for wear and damage, then cleaned in a special cleaning solution, or replaced with another part depending on its condition. Parts that have friction surfaces, such as bands and clutches are replaced as are all seals and gaskets. The torque converter is also replaced, usually with a remanufactured one. Technical service bulletins are checked to see if the auto manufacturer recommends any modifications to correct design defects that were discovered after the transmission was built. Automobile manufacturers often make upgrade kits available to transmission shops to resolve these design defects.

Replacing or Overhauling a Transmission

When a transmission requires an overhaul, there are two options that you may have. The first is to remove your existing transmission and overhaul it, then put the rebuilt unit back in your car. The second option is to replace your existing unit with another unit that has already been rebuilt or remanufactured.

A word to the wise: replacing your transmission with a used one may not be your best option. Used transmissions often have questionable histories that could create a whole new set of challenges. New transmissions, meanwhile, are mostly aftermarket transmissions billed as new but are in fact rebuilt transmissions with new parts.

The cost of the repair is always top-of-mind and understandably so. Transmission repairs are usually unexpected (and unwelcome). The cost varies depending on the outcome of our diagnostic testing, and we will help you to understand the various factors that come into play. We also offer our customers flexible payment options.

Whichever route you choose, you can trust our transmission experts to get you and your car back on the road.

Visit Mister Transmission for an assessment on what transmission repairs you may need. Contact the Mister Transmission service centre nearest to you.

Featured Services
Transmission Repair

The evolution of transmissions has made these machines and systems increasingly complex. When transmission repairs are required, determining the cause and cure for what ails can be tricky.

Learn More
Transmission Technology

At Mister Transmission we have access to leading-edge diagnostic equipment, enabling us to offer you the fastest and most accurate findings about what’s going on inside your vehicle’s transmission.

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Transmission Maintenance & Service

Just as you have other parts of your car serviced, your transmission needs maintenance to ensure a long life and avoid transmission problems.

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Customer Reviews
Best place to go and...
Jennifer Bergen
Best place to go and get your vehicle fixed. Amazing staff. Highly recommend Mister Transmission.
Date: February 24, 2023
Website: Google
This is my go-to shop,...
Ashley M
This is my go-to shop, the customer service is over the top and you are treated like family. I highly recommend going here for car maintenance and oil change. You will not regret it.
Date: January 30, 2023
Website: Google
Mark from Mr.Transmission was absolutely...
Meredith Armstrong
Mark from Mr.Transmission was absolutely awesome to deal with. After having transmission problems multiple times, he was able to fix everything 100% and with what was able to go through warranty, he did. My truck was not easy to deal with, so his patience level was amazing. I wouldn't go anywhere else for transmission problems in the future.
Date: January 13, 2023
Website: Google
This place, the owner, the...
Elizabeth Patterson
This place, the owner, the everyone.. All of them absolutely amazing! From the free diagnostic to the surprisingly painless cost of fixing my car.. They are a wonderful, incredibly skilled, and most of all a caring crew. Go there for sure to get anything done for your car. I can't say enough nice things about them. They're so good that I am switching from my mechanic of more than five years and taking my car here for all of its service from now on. When you go here too, you sure as heck won't be let down or disappointed.
Date: November 30, 2022
Website: Google
They have amazing service and...
Dave Gravel
They have amazing service and was there to help diagnose my problem
Date: November 27, 2022
Website: Google
Top quality, always a fair...
Samson Hartman
Top quality, always a fair price, efficient and clean work. Highly recommend. I travel from London to have all service, and any work done for my business and personal vehicles here.
Date: August 27, 2022
Website: Google
Great fast service for all...
John Polanski
Great fast service for all types of vehicles
Date: August 5, 2022
Website: Google
Mister Transmission is by far...
Ali Johnston
Mister Transmission is by far the most devoted auto shop in St. Thomas. Mark and his entire team are phenomenal. Not only do they have incredible service, but the most honest and fair pricing around. If you're ever in need of auto services look no further then the team at Mister Transmission, they got you covered!
Date: July 19, 2022
Website: Google
They did an awesome job...
Sandy G
They did an awesome job on my 2014 jeep compass, manual transmission. Was having issues with it jerking in 2,3 and starting on 4th gear. Came to them for a second opinion thinking it was clutch (it wasn't). After testing her and doing a full careful inspection they figured out the issue (computer). They pre ordered the part and it was good to go thereafter. I definitely would recommend them, and will be going back for routine inspections. Thank you everyone, you did awesome!! To Mark and his whole team! Definitely gave me a piece of mind and she works better than ever!
Date: July 17, 2022
Website: Google
We dealt with Mark at...
Tim Ford
We dealt with Mark at Mister Transmission St Thomas for a transmission rebuild on a 16 Dodge Journey. The repairs went smoothly and in a timely manner. The client was very happy they were able to get their vehicle back the same week before the long weekend. Thank you for everything. Tim Ford, Claims Manager, Nationwide Auto Warranty.
Date: June 29, 2022
Website: Google
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