[Mike C]

1970 is a changeover year. MOST have the same length axles and housing as the 71-72 but not all. If you have the longer housing you can buy 71-72 axles.

Use the search button on the board as this subject has been covered extensively. You can buy conversion axles, but the wider 71-72 housing (or 70 converted if that’s what you have) is better for fitting wheels on a stepside since a zero offset wheel centers in the sell left to right. On a fleetside it might be beneficial to have the narrower housing for running big tires on a lowered rig.