I want to get one of these, but ive read the ring gear needs to be machined, is this true? I would send it to HL, but shipping would be rather much but if i order one i may go ahead and let them do it, sinc they know what they are doing. Im not worrying about putting it in, just the machining part is what scares me. Anyone with one let me know about the install and how it is holding up.