i went to the yard today and all they had was a non disco 30 with 3.54/3.55s from a 90 my question is what do u guys do with the vac lines when u get rid of the disconnect, and the guy kept say that i would have to swap out the knuckles and the brakes but he never told me why anybody have any idea wth he could have been talking about, also would it make any difference if i had 3.55s on one end and 3.54s on the other?