9" spindles to 10" spindles

Miszny said

So B Body 10" drum spindle will work with my lower ball joints correct?

Is the hole pattern different on A Body spindles? From the photos it seems to be different.

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No they won't fit your upper control arms as they are now. The hubs are different on the B-body spindles so I don't think your kit would even match the the B-body spindles. That would be a question for SSBC.