Transmission Repair & Service St Catharines, 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 was told by the...
Winston Kran
I was told by the dealership that my GMC needed a transmission. Jordan and Eric informed me of a "TSB" or something like that about replacing my fluid and filter 2x. They completed the service and my truck runs nice and smooth now!! Thank you very much for getting this done and saving me from putting a new transmission in! Even if you like your mechanic, if you have a transmission issue go see these guys!
Date: October 23, 2025
Website: Google
Quick to take an appt....
Gordon Bell
Quick to take an appt. for our 2016 Mini Cooper Clubman S. Service was completed quicker than they promised for the quoted price- which was very reasonable.
Date: October 21, 2025
Website: Google
Amazing. Just amazing had an...
Matt Macpherson
Amazing. Just amazing had an unrelated issue which the shop next door was also able to take care of which they also took care of. Highly recommend talked me through the whole process and kept me updated.
Date: August 8, 2025
Website: Google
Had my transmission fluid changed...
Namik Mamadov
Had my transmission fluid changed at Mr. Transmission and everything went great. Jordan at the front desk was friendly, professional, and made the whole process smooth. The service was quick and the price was amazing – literally half of what the dealership quoted me. No pressure, no upselling, just honest and efficient work. Definitely recommend if you want solid service without overpaying.
Date: June 25, 2025
Website: Google
Good people good prices definitely...
Jason Yurczsyzyn
Good people good prices definitely recommend them.
Date: January 11, 2025
Website: Google
My husband Victor just picked...
Christine Deverson
My husband Victor just picked up our car. He’s so very pleased with the service and price. In his book he would leave 10 stars if he could. He says why go anywhere else when you have access to the best.
Date: January 10, 2025
Website: Google
I wanted to wait a...
Ziggy Z
I wanted to wait a while before writing a review. So it has been a little over one year since Mister Transmission in St. Catharines rebuilt the transmission in my 2007 Ford Explorer 4x4. They did a superb job! Since the rebuild I have taken long highway trips, hauled my 25 foot boat on shorter trips, gone exploring on bush roads and some off road, as well as the regular day today driving. Maybe it has something to do with the updated parts they used, but it works better than it did when the vehicle was new. The repair took longer than expected because some of the parts were hard to get due to my vehicle's age. But they managed to find them all, one came from northern Quebec. And they even covered the extra days of car rental for me! Thanks guys.
Date: January 4, 2025
Website: Google
This place was amazing. My...
Chuck Robillard
This place was amazing. My Wife car needed work. They found a not from Honda to replace the fluid a couple of times in a row. Got that done, and car runs great now!!! No more vibration!!!
Date: December 20, 2024
Website: Google
Great customer service. Very helpful...
Michael A.
Great customer service. Very helpful and knowledgeable
Date: December 13, 2024
Website: Google
Good and honest people
A Malik
Good and honest people
Date: December 9, 2024
Website: Google
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