Transmission Repair & Service Markham, 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.

Learn More
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
image-reviews image-reviews
Customer Reviews
Roma is such a good...
Johnson Chu
Roma is such a good man i own a 92 Camaro and doing a transmission service at the other private mechanics shop but been sitting there over couple weeks i was frustrating at that moment and though my car is in a wrong place and worng hands and i saw this shop during i driving home with disappointed so i stop by and ask this Mr transmission shop to see any others options that i can choice .. i meet Roma there and he was very friendly an patient to me and listen on my situation he told me he will on my back if the other shop cannot deal on my Camaro or more delay without reason he released my stress with his conference and support but finally i am lucky got my Camaro back on today and looks like the job is complete but in the future if my Camaro need any transmission or others service i definitely choose this place before i go anywhere.. thank you Roma i am appreciated
Date: May 5, 2026
Website: Google
Roma was really helpful. He...
Andy Kong
Roma was really helpful. He checked my car thoroughly, gave me plenty of useful advice, and helped me sort out the problems. I'll definitely recommend this shop.
Date: March 13, 2026
Website: Google
Got all my fluids changed...
Ahmer Zaki
Got all my fluids changed here on my Mercedes very good prices and they do an excellent job definitely coming back here and would highly recommend
Date: March 7, 2026
Website: Google
Roma was a pleasure to...
Mariam Malang
Roma was a pleasure to deal with. Very honest and transparent about the problem and the cost to repair. Would highly recommend!
Date: February 12, 2026
Website: Google
Best place to get transmission...
Dinuk Abeydeera
Best place to get transmission done. Highly recommended 👌
Date: September 30, 2025
Website: Google
I had the pleasure of...
Raymond Tang
I had the pleasure of meeting Roma. I brought my mother in laws car in with a transmission issue. Roma took the time and care to diagnose my issue before providing me with a quote. Although we did not get our car serviced there due to our availability. Roma’s customer service was top notch. After the inspection he did not try to upsell me or pressure me into fixing the vehicle. I explained that my Mother in law is on a fixed income and won’t be able to fix the vehicle immediately as we may just have to sell it as is. Roma understood my situation and just told me to give him a call when we are ready, and handed back my keys. This was a very good experience as his communication was very transparent. I also took a peek into his shop, it was surprisingly clean for a garage. I highly recommend talking to Roma for any transmission needs!
Date: September 17, 2025
Website: Google
Mister Transmission Blogs
Recent Blogs
Ford Transmission Replacement: Signs You...
Ford vehicles are built to handle demanding conditions — from city commutes in
Read More
May 07, 2026
Transmission Overheating: Why It Happens...
Transmission overheating is one of the most preventable causes of major vehicle
Read More
April 30, 2026
Manual VS Automatic Transmission Repairs...
Your transmission is doing a lot of work every time you drive — shifting power,
Read More
April 27, 2026
Dodge Transmission Replacement Cost: Wha...
Dodge vehicles have built a strong reputation for performance and durability —
Read More
April 16, 2026
Transmission Diagnostic Testing: How Exp...
Transmission problems are rarely sudden. Most failures develop quietly — slipping
Read More
April 07, 2026
Automatic Transmission Problems: Early D...
The automatic transmission is one of the most complex and expensive components in any
Read More
March 31, 2026
Transmission Repair Cost Guide: What Imp...
Ask ten Canadian drivers what they paid for transmission work and you'll get ten
Read More
March 24, 2026
Transmission Slipping: Causes, Warning S...
A slipping transmission is one of the most misunderstood — and most expensive to
Read More
March 16, 2026
Transmission Rebuild: When Is It Better ...
Many drivers face the stressful question when their vehicle starts slipping gears or
Read More
March 09, 2026
Understanding GM 6L80 Transmission Codes...
If your GM 1500 has triggered a check engine light or is displaying
Read More
March 02, 2026