a fixed and running corolla is worth more like k dont go by tradein value its a terrible metric you should also shop around is the quote for a new rebuilt or salvage transmission whats the labor rate and number of hours quoted i bet you can get a salvage tranny installed for repair to a k car is a different ballgame than a repair to a car if you keep up on maintenance the corolla should be a gt year k mile car acts of god notwithstanding and as long as you dont get kids or a big dog the popular sentiment is dealership beware you should absolutely disclose issues when selling a car to a human but big faceless corporations are already screwing you over so eff em they can figure it out on their own