Re: 63 3/4ton control arm swap
the only way that you could perform your conversion without changing the suspension crossmember would be to weld on the saddles needed for a typical round lower control arm shaft. This would have to be done very precisely, otherwise you will never get the front aligned correctly.
There was a member here on the forum that said that the C10 disc brake lower balljoint will fit the C20 lower control arm if the hole is opened up slightly. Something like a sanding drum/flap wheel on a die grinder would work. But that does not allow you to use any other control arms other than stock '63-'66 C20 lower control arms.
I could sell you a stock C10 crossmember, but I'm sure the shipping would be high. Maybe someone closer has one.
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