Report "I purchased a cv shaft and had someone install it. Tranny was slipping for a little while afterwards, but still running. Last week, the car got very overheated. Had it towed into a shop. Mechanic said that the radiator blew and took out the motor. He said that the cause of all the damage was because the cv shaft was too small and caused the leak? Is it possible that a cv shaft could be too small and still fit the car and would it have caused all that damage?"