[Captainfab]

To upgrade a '60-'66 C30 to front disc brakes is basically the same as with a C20. With the flat lower control arm shafts on the '63-'66 C20 and 30's, you can not just change the control arms for the '73-'87 arms. I have not tried this, but another member here says that the '73-'87 lower ball joints will fit the '63-'66 lower control arms if the holes are enlarged slightly with a drum or flap wheel on a die grinder or drill. On my '66 C30 I simply changed the whole front suspension, crossmember and all. In fact I used a '73-'87 C20 front suspension and will install the dually spindles. I always change the entire steering linkage to the '73-'87 components. That way you don't need those special tierod adapters (I don't know if they make them for a C30) and there is no confusion trying to remember what year parts you need later on. You will just have to drill 2 new holes for the later model idler arm bracket.