Can an 84 s10 cab fit on 1ton daully?

No, an '84 S10 cab will not fit on a 1-ton dually chassis. The S10 is a compact pickup truck, and a 1-ton dually has a significantly wider and longer frame, different mounting points, and a much heavier-duty suspension. The wheelbase and overall dimensions are completely incompatible. You'd need a substantial amount of custom fabrication, likely beyond the capabilities of most shops, to even attempt such a project, and the result would likely be structurally unsound and unsafe.