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Used and remanufactured transmissions that fit the 2021 Mazda MAZDA 3 MT. Each unit below is matched to this vehicle, warranty-backed, and shipped with freight quoted at checkout from Peak Powertrain.
Rule of thumb: a transmission replacement is usually worth it when the installed cost stays under 50% of what the 2021 Mazda MAZDA 3 MT is worth — most units below beat that comfortably.
As a general rule of thumb, a transmission replacement on a 2021 Mazda MAZDA 3 MT (mid-size sedan segment, vehicle value roughly $10,152–$12,920) is usually worth it when the installed cost stays under about $5,768 — roughly 50% of what the vehicle is worth.
