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
I don’t even know where...
Akayla Mitchell
I don’t even know where to begin. Mark went above and beyond from our first conversation and walked me through everything and kept me updated the whole way. My car ended up being more complex then we all originally thought but the team handled it amazingly and Mark made sure I understood everything that was happening and worked longer hours to help trouble shoot. I must say have to worry about a big repair on a 3 month old car was not something I imagined having to navigate but Mark showed compassion and honesty I would go back in a heartbeat(hopefully I won’t need to for a long time!) Thank you again Mark, Tyler and team. My car runs 1000x better than when I bought it.
Date: May 16, 2024
Website: Google
Great work and good prices!...
Tyler Cayen
Great work and good prices! Quick oil changes too! Been going here for years
Date: May 14, 2024
Website: Google
Mark, Tyler, Branden, and the...
Chelsea Bechard
Mark, Tyler, Branden, and the guys here are absolutely amazing!!! They made my brake service absolutely seamless. They are incredibly nice, honest and professional. Thank you for taking care of my vehicle and allowing me to trust you in this process.
Date: April 24, 2024
Website: Google
Always friendly service from guys...
The Jester
Always friendly service from guys who actually care. Go see Mark he will treat you right!
Date: April 21, 2024
Website: Google
All I can say is...
Miss Kelly
All I can say is WOW!!! I had an emergency with my vehicle that has a mind of its own and with Tyler's excellent customer service and problem solving skills, I was able to get back on the road right away. All the staff was welcoming, friendly, understanding and caring. I can't recommend them enough. Thank you so much!!! :) ❤️
Date: April 20, 2024
Website: Google
Excellent service. Brian and other...
Navjot Kaur
Excellent service. Brian and other team members were very helpful. They gave honest advice for my vehicle and I can’t thank them enough for saving my thousands of dollars on repair.
Date: March 16, 2024
Website: Google
Amazing customer service! Super friendly!...
Cynicalest T
Amazing customer service! Super friendly! Family owned by mark and son both awesome people!
Date: March 15, 2024
Website: Google
Mark and his staff are...
Ryan Rose
Mark and his staff are the BEST!!! Kind, knowledgeable, transparent. Will gladly take any and all of my future business to him and his exceptional team.
Date: March 15, 2024
Website: Google
Mark and his team are...
Doaa Hassanien
Mark and his team are amazing, they are the most honest and hard working mechanics I have ever worked with.
Date: November 24, 2023
Website: Google
Mark and Ty are an...
Stephanie Keillor
Mark and Ty are an incredible father son duo that know their stuff. I’ve taken my car to many places that guess and you can tell. These guys have tons of knowledge and will do the work to figure out what’s going on with your car and give quality work for the best price. They have also caught mistakes from other shops and fixed. Highly recommend!!
Date: October 3, 2023
Website: Google
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