Keep in mind the converter hub/snouts like to crack on 904's. I havent used one forever, but surely this is an issue that should be considered when thinking about a 904. Dont know if converter companies offer thicker walled hubs, but if they do, DEFINITLY get it. I bought a rather expensive converter for a 904 once and the hub broke off in the trans driving down the street, that was the last 904 for me.