i have a 70 bronco dana 30 front and want to put disc brakes what parts truck should i get them off of i also have a 71 with dana 44 wich i am building as my rig and would like to do disc front and possibly rear any help would be helpful thanks

It's the same for the D30 and the pre-76 Broncos. You have to clearance the knuckle for the caliper. Just don't forget to do that or else you will have braking problems.

http://classicbroncos.com/disc_faq.shtml