They are both front axles. The Chevy Dana 60 is from an '89 GM truck and it has 4.10:1 ratio gears in it. The Dodge Dana 60 is from a '92 diesel truck with 3.55:1 ratio gears. I plan to put an '06 ...

As you can see from the chart, the Dana and Strange S-60 rear axle offers the lowest ... so we would be upgrading both the gear ratio to 4.10:1 and to the Strange S-Trac limited-slip.