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.

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
Used these guys years ago...
Mike DeGasparo
Used these guys years ago and I'm glad to see they're still able to good work like they did on my chevy venture 20 years ago. Way to go guys, good job!
Date: April 17, 2026
Website: Google
Professional place, good service. Had...
Edmund Derose
Professional place, good service. Had my transmission rebuilt and back to me in the time they promised and at the price they quoted no surprises. It's hard when transmission is so expensive but at least they got financing set up and helped me with a rental. Don't want to ever go through that agin but I would recommend.
Date: March 13, 2026
Website: Google
I brought in my 2019...
Nafees Imtiaz
I brought in my 2019 Chevy Equinox Diesel. I am giving it 5 stars after careful observation by driving the full kilometre limit of my warranty. I paid in full through a bank draft after a full rebuild consisting of the torque converter and a replacement of the valve body along with some solenoid sensors were done. Gamble paid off. However, I must indicate no repair work will fully restore a vehicle to its original state. I am thanking them with all my heart. Not a friend, nor family, just a stranger. Mister is an understatement here, they are Doctors. Carry on!
Date: February 6, 2026
Website: Google
These guys are amazing. My...
Richard Kearsey
These guys are amazing. My regular mechanic doesnt do transmissions so he sent my car to a transmission shop he deals with and they said my transmission need to be replaced to the tune of $4000. I found these guys on line, they checked it for free and guess what, fixed it, works perfect for $786. Thank you Mister Transmission.
Date: January 18, 2026
Website: Google
I was referred there by...
David Patterson
I was referred there by my friend who works for Peel Regional Police and he told me that's where they fix their cars. Great service and a good job. They rebuilt my 2017 Rogue transmission after other places told me they couldn't do it and dealer wanted crazy money. These guys saved me money and it’s been 3 weeks and it works like when it was new. I will recommend Mister Transmission.
Date: January 11, 2026
Website: Google
Excellent service, fast, efficient and...
Kim F
Excellent service, fast, efficient and friendly
Date: December 22, 2025
Website: Google
Honestly, best mechanic experience I’ve...
Starvin Marvin
Honestly, best mechanic experience I’ve ever had!They tell you what’s wrong with your car, how it might have happened, and they explain in detail how they will fix your car and find parts within your budget. Overall, they made me feel like I can trust them and and I highly recommend them
Date: September 2, 2025
Website: Google
I'm thoroughly impressed with the...
Dave Cox
I'm thoroughly impressed with the transmission work done at Mister Transmission! The price was fair, and the communication was top-notch.
Date: August 27, 2025
Website: Google
Great professionalism from the staff....
Ernest Arutiunian
Great professionalism from the staff. Clear explanations and genuine desire to help the client.
Date: August 27, 2025
Website: Google
My 2016 Honda HRV had...
Chris Njoki
My 2016 Honda HRV had been making a growling noise at certain speeds. My regular mechanic wasn't certain what the issue was and he rightfully referred me to these transmission and driveline specialists. With a drive around the block and afew more tests, Mike was quickly able to diagnose that the issue was my driveshaft. He provided options and walked me through the whole repair process in a refreshingly transparent manner. By the next afternoon my car had a new driveshaft installed was running as good as new. I highly recommend this business!!
Date: June 3, 2025
Website: Google
Mister Transmission Blogs
Recent Blogs
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
Transmission Replacement: When Your Vehi...
A full transmission replacement is one of the most significant services a vehicle may
Read More
February 27, 2026
Honda Transmission Repair: Understanding...
Honda transmissions are known for their smooth shifting, fuel efficiency, and long
Read More
February 20, 2026
Transmission Fluid Change: Benefits Of P...
Modern vehicles depend on advanced transmission systems that require proper care to
Read More
February 13, 2026