Drum to Disc brake swap

Garys72Duster said

I've been reading posts on converting a 72 Dart from front drum brakes, to disc. As I understand, the upper control arm needs to come from the 73-76 A Body, as well as the other disc brake parts. I'm confused as to the lower ball joint. Apparently the only difference is the later ball joint bolts to the steering knuckle with larger bolts, right? So you can either use a 73-76 ball joint, or drill out the bolt holes in the early ball joint to accept the larger bolts? Is that the way to do it? Thanks!

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If you use factory parts from '73 - '76 (A-body) donor, you will end up with 4.5" bolt circle in front and original 4" circle in rear. Unless - - you intend to use the (pre-'73) factory 4-piston caliper setup. But, good news is that the lower control arms for your '72 are identical to the later model, so ball-joints will interchange (as needed). There are plenty of good used and new replacement parts available to tailor to your needs and wishes. Compare your options and work them into your budget.