im trying to help a buddy out looking to do a disk brake coversion on the front of a 1970 2wd 1 ton wreaker whats all needed?
I think Boz thought you mean a REAR disc conversion.
For the uninitiated, note that some 67-72 trucks had FRONT drums as well as rear. Shudder.
Now, as to what to change ... I don't know about the 2WD trucks. On the 4WD's it's easier, as you get later Dana 44 stuff and call it good.
On the 2WD, *if* the factory offered front discs in a like truck (i.e. 2WD 1-ton), any time in the 67-72 years, you should just be able to get everything for such a truck and transplant it.
I would guess you'll need spindles, the hubs and bearings, and then obviously the rotors, calipers, and brake lines.
You would prolly also want a master cylinder designed for disc fronts, and in this instance you might want to swap proportioning valves, made easier as IIRC they're bolted to the master.
I have not seen any kits, but then I'll admit I don't know much about pre-73 trucks. I would check out
http://www.67-72chevytrucks.com/
for what should be obvious reasons
-- A