Used and remanufactured transmissions that fit the 2018 GMC Terrain. Each unit below is matched to this vehicle, warranty-backed, and shipped with freight quoted at checkout from Ironclad.
Rule of thumb: a transmission replacement is usually worth it when the installed cost stays under 50% of what the 2018 GMC Terrain is worth — most units below beat that comfortably.
Based on 6 recent market listings, a transmission for a 2018 GMC Terrain typically runs $4,685–$4,685, with a median around $4,685.
As a general rule of thumb, a transmission replacement on a 2018 GMC Terrain (mid-size sedan segment, vehicle value roughly $6,235–$7,935) is usually worth it when the installed cost stays under about $3,543 — roughly 50% of what the vehicle is worth.
Based on vendor-verified fitment data across 100 listed transmissions, remanufactured and new transmissions for this model cover the 2010–2018 model years. Always confirm your exact VIN or engine/transmission code before ordering, since fitment can vary by submodel or engine.
