Hey ive got an 86 chevy.. i put a 2wd box on it for crossover about a year ago..now im putting a box i got that's already tapped for hydro assist and the rag joint from the old box wont fit on.. this box has a bigger input shaft. do i need to go to a junkyeard to get a diff rag joint? what should i look for? im not sure what year my new box is but the fittings seemed like the same. in what years did the input shaft get bigger?