hi i am new here and dont use th computer much but my son and i have a 1955 gmc 1st series that is a 4 door crewcab fire truck.i am in the process of updating the running gear,by the way it is a 450 series.i need info on up grading brakes to disc and want to put a 5.9 cummins in it.any help would be appreciated.thanks cat
