To receive the full core deposit back, the core returned to Goerend Transmission must be an unmodified core of the same model of the purchased converter. (Year, Type, Etc.) No part of the core may be rusty/damaged in any way, or you may receive partial to no credit towards your core deposit. When a usable core has been received, the core charge will be refunded to your original form of payment. Call for any questions on what cores are accepted. Make certain your truck is compatible with the parts included in this kit. We design our parts to be compatible with OE specifications. Goerend Transmission is not responsible for damage caused to our parts due to improper installation or other defective, worn, or broken parts.