I've finally got the axles under my scrambler and I've just started putting in my drive train. I'm replacing the iron duke/sr-4/dana300 with a 350/sm465/np205. The problem I'm having is I can't figure out how to hook up the speedometer cable. The one on the jeep is too big. Will the one from the doner truck work with my speedometer gauge? Do I need to get a custom one made? This swap seems to have been done alot so anyone with experience your wisdom would be helpful.