A transmission interchange guide is a listing of transmissions that shows which model of transmissions fit into specific model vehicles. Transmission interchange guides provide necessary information when replacing a faulty transmission or choosing a new one with different features than the original.
Transmission interchange guides typically list the model, year, engine type, transmission type and transmission model number. Many transmissions that carry the same model number are cross-compatible with multiple vehicles, but have different transmission speeds and fit different engine styles. Transmission interchange guide websites, such as TXChange.com and RaceTransmission.com have a list of commonly interchanged transmissions and vehicle models, and sometimes offer quotes for new transmissions.