Thanks for the info. I have the 727 and 727 torque convertor. It sounds like the 904 will fit. Sounds like I need a 904 torque convertor. Does the 904 torque converor need to come from a 360, or will one from a 318 fit? Does the internal/external balance just applies to flywheels if you have a manual tranny? Thanks again. Hope to have it on the road soon.