I have never done this. but why would you use the later arms with the sloppy rubber bushings? 73-87 ball joints will fit the 70 arms & then you will have more accurate & ridgid suspension.
what I have heard of is using the "saddles" with the larger pins & u-bolts from later. just cut the rivets off & install them on your 70 with some leaf spring center bolts.
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Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
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