Looking for the following info if anyone can provide? Prelininary questions: 1/ How do I determine what the diameter is of the packing I will require? I guess I will need to know my straight shafts diameter - correct? And if so, can this be determined based on my year and model or perhaps on the transmissions specifics? 2/ Once determined, what is the best material for the packing material and can anyone recommend a specific manufacturer / product? Thanks to all!