Re: 1987 gmc axle swap ??
I'm not exactly sure - hopefully some other guys will chime in - but it should be close.
Keep in mind a "G20" is really the same as a "C10" with the 5 hole/5" bolt circle. G vans didn't get the 8 lug setup until the G30 series.
The only thing that might be different would be the positioning of the spring perches. If you jumped on this one and they weren't right it would still be a (relatively) easy fix.
K
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