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yes no disc brakes on anything til 71
70 was last year for 6 lug 2wd
and 4x4 didnt make it any different
neither if they were blazers, no difference, the 2wd blazers were 5 lug after 70 also
no 6 lug 2wd rotors were ever produced factory
yes you can nowadays finally buy 6 lug front rotors 2wd, they are all aftermarket
you can swap entire engine suspension cradle over to a 70-down truck from a 71-87 truck
70 and up rear axles widened by 1.5" no matter if std or HD brakes 2" vs. 2.75" wide such as the Big10 pickups and any that had HD suspension options that increased GVW rating enough to require the thicker rotors and wider rear shoes.
you can bolt the 2.75" brakes(from the backing plate out to the drum) to a '69-older axle and use 71-up shafts(31 3/16" long overall minus the studs) and convert the older axle over to 5 lug without any mods
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I am in the process of converting a 70 to disk, 5 lug by putting the 73 and up knuckles in the front, and 5lug axle shafts in the 12bolt, are you saying the shafts will not be the right fit?
I could swap the axle all together but it's the coil suspension rear and i want to retain that.