From your transportation means to your wildest dreams, Complex Auto's Engine Rebuilding has what you need!

Complex Auto's Engine Rebuilding was opened back in 2010. Complex Auto has rebuilt hundreds of engines as one of Ontario's largest engine rebuilders. We strive to give the best turnaround time possible while ensuring the engine passes all our quality control checks. Using the latest tools and equipment, our experienced machinists will strip, recondition and rebuild your engine quickly and efficiently, paying close attention to detail and using quality engine parts. Our state-of-the-art testing equipment enables us to rebuild any engine to the highest possible quality.

Our well-appointed engine factory employs the latest technologies, highly trained technicians, and machinists to ensure your engine will benefit from the best attention to detail and the highest quality components.
Our experienced team will rebuild your engine to top condition. We use the latest technology to provide high-quality service and quick turnaround. Our machinists are highly skilled and have years of experience. Most of all, they love engines and care about yours. We offer honest and reliable rebuilding services, and we like to think we do it right. Whether it’s our quick, quality, friendly service or the honesty and value we bring to every interaction, our customers love us!

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Authentic Custom Transmissions

The staff of Complex Auto Authentic Custom Drivetrains, a division of Complex Auto Engines and Transmissions, understands the pride and satisfaction that our customers have in the ownership of a classic vehicle.
We show that understanding in our attention to detail, the quality of our work and in making sure that you will be satisfied with the experience you have with us – from the interaction with our staff to your completed transmission. We offer custom “days gone by” remanufactured transmissions for your special project. The transmissions we can build for you include: Borger Warner Three Band, C4s, Dual Range, Dynaflow, Ford-O-Matics, Hydramatics, Jetaways, Jensens, Roto Hydramatics, Powerglides – cast and aluminum, PowerFlights, and more.
The Authentic transmissions we build can be found in Buicks, Cadillacs, Chevys, Chryslers, DeSotos, Dodges, Fords, Hudsons, Kaisers, Lincolns, Mercurys, Nashes, Oldsmobiles, Plymouths, Pontiacs, Ramblers and Studebakers.

We focus on maintaining authenticity because many of the transmissions we receive are for numbers-matching vehicles. Should a major casting such as the case, bell housing or extension housing not be suitable, we will contact you for your instructions. If you should instruct us to replace any of these castings, we will return your original castings so that you can document the authenticity of your vehicle. You can request that your Complex Auto reman transmission be painted or left unpainted as the original unit might have been.


Transmission Soft Parts

Banner kits, Bushing kits, Friction Modules, Thrust Washers, Filters, Seals, Shift Kits, etc


Transmission Hard Parts

Gear Trains, Drums, Planetaries, Pumps, Sprags, Sprockets, Chains, Belts, Pulley Sets, Valvebodies, Cases, Remanufactured.


Torque Converters

We remanufacture our own torque converters with best quality materials and machinery.



Count on the licensed technicians at Western Automatic Transmission to take care of all your transmission repair needs. We honor all manufacturers' warranties.



Trust us to offer you a reliable evaluation of your vehicle and can fix your automatic and manual  transmission problems. Ask us about our workmanship warranty.



Get your vehicle's transmission replaced at a reasonable price. We have over 60 years of experience in the industry and guarantee your satisfaction.


Differential Repairs

Let us take care of your differential repairs, automatic and standard transmission problems.  Ask about our price matching and same-day estimates