Transmission Repair & Service London, 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.

Learn More
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Customer Reviews
Great team here!
Bryan Abel
Great team here!
Date: December 31, 2024
Website: Google
Peter is the best and...
Andy Couto
Peter is the best and I trust him because he is honest.
Date: December 9, 2024
Website: Google
Great service shop! Honest mechanics...
Aaron Greenhow
Great service shop! Honest mechanics that have years of experience. you can trust this shop! Will be back for my regular maintenance.
Date: November 12, 2024
Website: Google
We had a true emergency...
Eli-Kristin Ward
We had a true emergency and this shop saved our home and livelihood, literally. The car is also in an excellent mood after the visit!
Date: June 13, 2024
Website: Google
Quick service, friendly staff and...
Damian Gorka
Quick service, friendly staff and very honest. I definitely recommend this shop for your transmission service.
Date: May 21, 2024
Website: Google
I had an issue with...
Scott J
I had an issue with my Nissan Altima jerking on the way home. Waited into I could take it here and have them do a quick test drive (which is free and very nice, though they may not feel the same issue which is the hard part). Peter was able to tell something was wrong and it’s a common issue with the CVT transmission on Nissans. He took us in the back of the shop as they were currently working on one and could show us the pulleys and CVT housing and the one piece that fails. Unfortunately, due to the price of the parts from Nissan, and low margins, and the fact that in order to fix the one small part would require a whole new transmission to ensure everything was new, it would be $4,500-5,500 + taxes. This is basically the value of the car (probably more than the worth) so not really an option for us. We appreciated the detailed info and seeing the parts and the free test drive. Very helpful - so if you have an issue with your transmission and know nothing about cars (like me), definitely worth it to take here.
Date: May 19, 2024
Website: Google
Peter and his team did...
Peter Cadieux
Peter and his team did a great job! Very fair pricing and quick turnaround!
Date: May 10, 2024
Website: Google
Google reviews brought me in,...
Steve McRoberts
Google reviews brought me in, the service and honesty will bring me back. Peter is amazing and saved me from spending money I didn't need to. 10 stars Thanks again
Date: May 3, 2024
Website: Google
This location has some wonderful...
Tamara Lawrence
This location has some wonderful people they go above and beyond for there customers ty so much for all you do.
Date: April 8, 2024
Website: Google
The staff was extremely knowledgeable...
Josh Whitbourn
The staff was extremely knowledgeable and helpful with any of my questions and made a very frustrating situation much easier to deal with!
Date: February 26, 2024
Website: Google
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