Re: E-350 Dana 60-70 fitment?
No, those years they are not really interchangeable. In '08 the brake rotors became larger, and the calipers became much larger (even though the pistons shrank slightly). You cannot put the '08 calipers on the older axles, because the mounts changed as well. Technically, I'm sure you could do it, but you'll lose the brakes upgrade. The housings did not change, except on the cutaways. Those became wider, which could be a problem on a slider van. As far as I could find, all '08 Wagons with RSC came with the full float, while all non-RSC vans got the semi. The RSC/non-RSC axles have different ABS sensors and mounts (RSC axles have ABS tone rings in the rotors). But the rest of the hardware is the same. Cutaways don't get RSC, so if you have swinger doors, this is probably the best option (fender flares would be a must though).
Yes, the D60 carriers are the same whether full of semi float. However, there are differences for spline count, and gear ratios.
My Dana 70 came with a D60 carrier from the factory, and I had the carrier upgraded to the D70 carrier. This apparently required a new ABS tone ring. So I suppose doing the opposite (putting the D60 carrier in) should be doable. But with the added expense of the ABS changes, would it really pay off vs. putting the stronger carrier in?.
I did the D70 upgrade because the D60 is only good for 20,000 pounds combined, and even then is marginal. My combined weight can top 25,000 and that may go up in the future.
2000 E450 dually V10 wagon