If your transmission is slipping, won't go into gear, or frequently burns transmission fluid, it may be necessary to rebuild it. If you intend to rebuild a transmission, a transmission rebuild kit or transmission overhaul kit will be required. A transmission overhaul kit contains more replacement parts than a rebuild kit, including all the gaskets, seals, bands, and O-rings needed for a complete overhaul. Replacing all of these parts during your transmission repair can help ensure that all wear items in the transmission are brand new. If you need a transmission overhaul kit, rebuild kit, or other transmission parts, check out the selection at O'Reilly Auto Parts.