what should the lenth of the output shaft be on a th400 4wd? the one i have measures 3 1/2" from the end of the case to the end of the shaft. this will be for a th400/np208 setup. what i am seeing is the adapter housing on my th350/np208 takes up roughly 4 inches. the adapter plate i got off the junkyard today to convert to a th400/np208 is only 1 1/4" thick. so the way i see it ,the output shaft is too ong on the new th400 i got. Or is there a differant adapter out there i need?