I have a 203 shifter body that someone wants to buy and I have no idea how to check it effectively, or what areas to look at where they "typically fail". I don't want to send it without knowing it's good... Also, it's covered with grease, would a good dunking/soak in diesel fuel clean it without hurting it? Are there any rubber bushing type things inside that would be damaged? I could dissassemble it, but frankly, it's not worth fooling with it that much...