What Is a Transmission Flush and Do You Need One?

Maximizing the life of your vehicle’s transmission depends on regular maintenance including getting a transmission flush every three years

Among the myriad of moving parts and components that comprise your vehicle’s engine, the transmission is one of the most important, and it could be one of the costliest to repair or replace in the event of a complete breakdown.

The key to ensuring your transmission is in good working order is a matter of regular maintenance which includes getting a transmission flush every three years or as per the information in your owner’s manual.

What is a transmission flush?

Simply put, it’s a process by which transmission fluid is drained, followed by a process of removing all the grit, grime, and sludge that has been building up inside your transmission. Once completed, your old transmission filter is replaced (if accessible), and new transmission fluid is pumped back into your transmission all while adhering to the specifications of the manufacturer.

How to Tell If You Need a Transmission Flush

There are typically a few telltale signs if the automatic transmission in your car, truck, or SUV requires a transmission flush, including:

  • Your transmission fluid is a dark smoky colour and has a burned odour
  • You notice a leak
  • Your vehicle surges or stalls temporarily after being put into gear
  • The gears are slipping
  • You’re having problems changing gears
  • Your transmission is making strange noises

Remember: a transmission flush is a preventative maintenance procedure, not a cure-all for larger problems if your transmission or any of its moving parts are wearing down.

Book an appointment with Canada’s transmission maintenance and repair experts at Mister Transmission.

For more than 50 years, Mister Transmission has kept Canadian motorists on the road by ensuring the transmissions in their vehicles are in tip-top shape. If you have a question about your transmission or want to book a service appointment, contact the Mister Transmission service centre nearest to you.

Mister Transmission Team

The Mister Transmission team consists of certified transmission specialists with decades of combined experience in diagnosing, repairing, and maintaining automatic and manual transmissions.

With over 60 years of service across Canada, our experts provide trusted, accurate, and up-to-date automotive advice to help drivers make informed decisions about their vehicles.

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Customer Reviews
Exceptional amazing people helped me...
Michelle
Exceptional amazing people helped me with a transmission diagnose to get me back on the road, as I was doing a RV road trip around Eastern Ontario. Thanks so much to the team at Mister Transmission! Lots of love to Justin and the team!
Date: September 25, 2026
Website: Google
I brought my small car...
Brycen Bondy
I brought my small car to Mr transmission to have them install a new clutch and resurface the flywheel they did an awesome job and the customer service is excellent! I would recommend them to anybody
Date: September 25, 2026
Website: Google
The service at the front...
K Thax
The service at the front desk was second to none. The repair to the transmission was done in a timely fashion. The price was great and she runs like new.
Date: September 25, 2026
Website: Google
Brian was great!, super friendly...
Anna Lee
Brian was great!, super friendly and informative, the transmission rebuild took the time and price he originally quoted and there were no surprises! Thanks again! ☺️
Date: September 25, 2026
Website: Google
Exceptional amazing people helped me...
Michelle
Exceptional amazing people helped me with a transmission diagnose to get me back on the road, as I was doing a RV road trip around Eastern Ontario. Thanks so much to the team at Mister Transmission! Lots of love to Jennifer and the team!
Date: September 25, 2026
Website: Google
Diagnosed and fixed transfer case...
Rick Dyas
Diagnosed and fixed transfer case leak within the week. Even went so far as to pick me up/drop me off as I was stuck for a lift to/from the shop. Great group of guys, wouldn’t hesitate to bring my vehicle in for any tanny issues. Price was reasonable and as quoted, no surprises.
Date: September 25, 2026
Website: Google
I am very pleased with...
Paul Parkinson
I am very pleased with the service at this Ajax location, I dealt with Ron several years ago and was happy with the service and warranty offered for a transmission job. 10 years later I find I need the rear differential rebuild and I am pleased to say that I was taken care of in a timely manner with great service. Highly recommend this location! Paul
Date: September 24, 2026
Website: Google
Great business. Friendly and helpful...
Leah Boyd
Great business. Friendly and helpful staff. Won’t take my vehicle anywhere else.
Date: September 24, 2026
Website: Google
Great service. They went the...
Alvaro Filipe
Great service. They went the extra mile to get my minivan completed in record time
Date: September 24, 2026
Website: Google
40 minutes from diagnosis to...
George L
40 minutes from diagnosis to on the road again!!!! Evan diagnosed a defective cylinder coil on my F150. Replaced it and had the keys back in my hands in 40 minutes. Absolutely magnificent. I wish all businesses had such good customer service. Thank you Dave, Evan and the staff for restoring my faith that there are still places that have good customer service
Date: September 24, 2026
Website: Google
Featured Services
Transmission Repair

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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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