Transmission Repair & Service Ajax, 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
Great service, great communication. I...
Tom Mantis
Great service, great communication. I genuinely felt I was being taken care of. I recommend them without any hesitation!
Date: April 3, 2025
Website: Google
Professional service all the way,...
Brian Alphonso
Professional service all the way, friendly staff.Mike took the time to look at my truck and explained to me that I didn't have the problem the dealership was telling I have, so I appreciate his honesty 🙏
Date: March 15, 2025
Website: Google
Fast, friendly and cost-effective transmission...
Neil Walker
Fast, friendly and cost-effective transmission overhaul. Very pleased with the outcome and would definitely recommend Mr. Transmission Ajax! Mike is the best!
Date: March 5, 2025
Website: Google
I had such a AWESOME...
Pam Martin
I had such a AWESOME experience with Mike and his dad. I have a 2014 Mustang which I love. However I was throwing good money after bad as I tried to identify a problem as it was bucking and driving horribly. I took it to them and they identified the problem immediately and fixed it for a very reasonably price. I cannot explain how relieved I am to know my problem is solved. Driving it in the condition it was it would have ruined it in very short order. Thanks so much :)
Date: February 28, 2025
Website: Google
Brought my benz wasnt sure...
Pinz 1blunted
Brought my benz wasnt sure what was going mike the car genius diagnosed exactly what was going on with one spin around the block. Found the cheapest way to fix it which shoulda cost me a lot more then what was qouted as i spoke to a few friends about it i thank god for these guys my car was back in less then a week and running smooth as a mofo forever greatful 🙏🏿 if i can have them do everything on my car these are my guys..god bless them
Date: February 24, 2025
Website: Google
I have a 2017 Volkswagen...
Tim Scott
I have a 2017 Volkswagen Passat that I have never serviced the transmission on because it has been running smoothly. However, I wanted to do a transmission fluid change and I found Mister transmission in Ajax. I called them last week for an appointment and went in and met with Mike and had a number of questions about service that he was able to answer and made me feel comfortable and getting my vehicle service with them. I booked the appointment for this morning and as agreed the service was done as promised. I also asked about getting my oil changed at the same time and once again my request was accommodated. Within about 2 hours the complete service was done, Mike called me and within 10 minutes was at my place to drive me back to pay for and pick up my car. So far to be perfect. The customer service I received from the beginning to the time I picked up my car has been better than expected. Other Auto service places can learn a lot by the customer service at Mister Transmission. I gave them a Max five-star rating but would have given them higher if I had an option. Thanks again Mister Transmission and Mike.
Date: February 24, 2025
Website: Google
Long overdue review! Top level...
Neil MacMillan
Long overdue review! Top level summary, bring your vehicle to Mike and Rabih, they provide exceptional service. Huge thanks to them for helping me through a complex challenge and being able to get my vehicle back on the road and me trusting it is fixed properly! They worked through an expensive challenge, as Stellantis dishonoured my extended warranty and I had to have the transfer case on my SRT Grand Cherokee rebuilt. Throughout the process he consulted with me, always advising on options cost-wise and reliability. 3 weeks ago I had an issue start in the same drivetrain space, so I first brought it back to Mr. Transmission. Mike has gone above and beyond in working through the cascade of issues: just picked the truck back up today and its driving like new! Thanks again guys, will be sending everybody I know your way.
Date: February 14, 2025
Website: Google
Good work Mike.
Lunarticpickle
Good work Mike.
Date: January 24, 2025
Website: Google
Good work Mike.
Lunarticpickle
Good work Mike.
Date: January 24, 2025
Website: Google
Good work Mike.
Lunarticpickle
Good work Mike.
Date: January 24, 2025
Website: Google
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