Transmission Repair & Service Sarnia, 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
Jackie Lacey
Great service
Date: September 16, 2022
Website: Google
Was amazing and friendly service,...
Monty Banks
Was amazing and friendly service, very fast and accurate mechanics that know and love there job. Very open and kind to all customers who walk in and are always willing to help in any way or form in order to be Successful and make Mister Transmission the best location in Sarnia.
Date: July 26, 2022
Website: Google
I didn’t figured the issue...
KK Oddi
I didn’t figured the issue in my car for over a month and this guys just spotted issue with just 2 KM drive and fixed it in 2 hours. Great service.100% Recommendable.Service: Steering & suspension repair
Date: July 5, 2022
Website: Google
Had the pleasure of dealing...
Mario 13
Had the pleasure of dealing with Bob a few weeks ago. He’s super friendly and would’ve chatted with him for hours. Lol. On the mechanical side of things, I roughly knew what was wrong with my truck and he did pretty much what I thought was needed. He didn’t try to sell me and install more parts than I needed. Honest business IMO right there. Would definitely deal with them again if I needed to. Thanks Bob!!!
Date: May 27, 2022
Website: Google
I went in to set...
Blue
I went in to set up an appointment for them to see what exactly was wrong with my car, because they were busy and couldn’t see to my car they wanted to know what they were dealing with.When they saw my car Bob the chap I was dealing with advised me against driving it any further until repairs were done.I could have had a terrible accident and my car could have been totalled.If I need anything done to my car and they can do it , I’m going to them.
Date: May 14, 2022
Website: Google
I went in to set...
Blue
I went in to set up an appointment for them to see what exactly was wrong with my car, because they were busy and couldn’t see to my car they wanted to know what they were dealing with.When they saw my car Bob the chap I was dealing with advised me against driving it any further until repairs were done.I could have had a terrible accident and my car could have been totalled.If I need anything done to my car and they can do it , I’m going to them.
Date: May 14, 2022
Website: Google
I went in to set...
Blue
I went in to set up an appointment for them to see what exactly was wrong with my car, because they were busy and couldn’t see to my car they wanted to know what they were dealing with.When they saw my car Bob the chap I was dealing with advised me against driving it any further until repairs were done.I could have had a terrible accident and my car could have been totalled.If I need anything done to my car and they can do it , I’m going to them.
Date: May 14, 2022
Website: Google
I went in to set...
Blue
I went in to set up an appointment for them to see what exactly was wrong with my car, because they were busy and couldn’t see to my car they wanted to know what they were dealing with.When they saw my car Bob the chap I was dealing with advised me against driving it any further until repairs were done.I could have had a terrible accident and my car could have been totalled.If I need anything done to my car and they can do it , I’m going to them.
Date: May 14, 2022
Website: Google
Bob was very kind and...
Aelizabeth_93
Bob was very kind and easy to work with, and and big thank you to all staff!! They were quick to diagnose the issue with the differential and order the part we needed. They also made sure I got the best part for my vehicle before servicing, and with a new baby I really appreciated them being honest and waiting. It's also nice to drive my vechicle without hearing the awful noise it was making, and knowing every turn i took was probably making it worse!! It was also very helpful for my current situation to be able to use their financing option. If you need a repair but are worried about having lots of money up front, it was truly helpful and stress free!
Date: May 2, 2022
Website: Google
Bob was very kind and...
Aelizabeth_93
Bob was very kind and easy to work with, and and big thank you to all staff!! They were quick to diagnose the issue with the differential and order the part we needed. They also made sure I got the best part for my vehicle before servicing, and with a new baby I really appreciated them being honest and waiting. It's also nice to drive my vechicle without hearing the awful noise it was making, and knowing every turn i took was probably making it worse!! It was also very helpful for my current situation to be able to use their financing option. If you need a repair but are worried about having lots of money up front, it was truly helpful and stress free!
Date: May 2, 2022
Website: Google
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