Transmission Repair & Service Whitby, 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 recently had my vehicle...
Jamie Errington
I recently had my vehicle in for service with Whitby transmission. I had originally spoke with Denise who knew exactly what I wanted to have looked at. I booked it in for the initial look over, and they said that the they would be able to rebuild, not replace the unit. Honesty, who knew that existed anymore? Once the vehicle was ready, the bill was actually less than the original quote. A nice surprise. If you ever need transmission work done, and are hesitant, don’t be with Whitby transmission. Denise, Lee and the crew are honest straightforward people.
Date: September 22, 2025
Website: Google
Family owned and family friendly....
Greg Deeth
Family owned and family friendly. Very helpful, very knowledgeable and the service is great.
Date: August 17, 2025
Website: Google
Incredible service Denise room really...
Martin Berthelet
Incredible service Denise room really good care of us with our big problem she Even took care of the guarantee process she did everything to make it Easy for us
Date: July 31, 2025
Website: Google
Massive thank you for taking...
Kathy Pritchard
Massive thank you for taking my car on short notice to address a sudden issue. Everyone was terrific and helpful. I do not live in the area, but have visited the Toronto area with some frequency and would recommend this Mister Transmission to anyone who either lives in the area, or have a concern during their travels. Thank you!
Date: July 28, 2025
Website: Google
I would first like to...
S Williams
I would first like to say the customer service and Mister Transmission is none like I have ever experienced. I had the pleasure of speaking with Denise who was so professional, patient and indescribably kind. Not only did she take the time to detail what my car needed and how long it would take, they took the time to provide alternate cost efficient options. For those looking for transmission repairs , I promise you you will find no better!!!
Date: July 7, 2025
Website: Google
I was referred to this...
Joanne Greco-Fiore
I was referred to this location by another customer, who assured me they would be honest with me and do a great job. He was right! I dealt with Denise mostly and she was fabulous. Answered all our questions and really helped us to understand things better. So incredibly lovely and we wouldn’t hesitate to take our cars there in future. I would definitely send my friends and family there too!
Date: June 24, 2025
Website: Google
Honest, helpful and and great...
Carlo Fiore
Honest, helpful and and great service. Told us exactly what needed to be done and what our options were.
Date: June 24, 2025
Website: Google
Super friendly and efficient service....
Chelsea Frenette
Super friendly and efficient service. They were able to get my repairs covered under warranty, completed very quickly, and without stress to me. 100% would recommend!
Date: June 3, 2025
Website: Google
A huge thank you to...
Mohan Cappuccino
A huge thank you to Denise and Shawn for their honesty and integrity. Went to their shop expecting to need a torque converter, after the dealership "diagnosed" the problem. Shawn ran his own tests and found that the problem was something else entirely, unrelated to the transmission. Didn't charge a dime and saved me big $$$ on a repair that wasn't needed. Wouldn't hesitate to go back if I ever DO need transmission work.
Date: May 26, 2025
Website: Google
Got my car towed not...
Logan Harrison
Got my car towed not drivable at 1pm and picked it up at 5 pm driving perfectly and drove home with a smile on my face. 10/10 cant recommend more.
Date: May 21, 2025
Website: Google
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