Diamond Transmission repairs, installs, and sells transmissions, specializing in automatics and standards. We offer same-day service and free towing. All makes and models of cars, trucks, mini vans, and 4 x 4's are handled at our shop. From brakes to engine repair, we can get your vehicle up and running smoothly. Return to the road faster with the help of our transmission experts. Serving GTA including Toronto, Newmarket, Brampton, Barrie, Mississauga, Scarborough, Ajax, Oshawa.