add-a-leaf questions
But, as to IDing a D60, since the one you want was only used 85.5-1997, and only in F350's and is the only F-Series solid axle of that era, it should be a pretty easy piece to identify.
The diff cover has 10 bolts, the wheel hubs and brakes are the same part as what your Dana 50 has(if you find a Dually axle, your hubs will swap right over.) The 85.5-91 axles are kingpin, so, no balljoints, they look like so:

Notice the rectangular 4-bolt retained piece on the bottom of the knuckle, that's the lower kingpin.
This shows the whole assembly and upper kingpin cap pretty well:

This is a balljoint axle, with almost all of the parts needed to do the swap properly.

If you pull the axle from a donor truck, you want to get the steering, track bar and it's frame bracket, and while your existing front driveshaft may bolt up(mine is awfully close to hitting the trans crossmember) the F350 front driveshaft and front output yoke are very desirable, as the F350's run a dual cardan joint at the transfer case, which helps with angularity, and moves the driveshaft pivot point ahead, so it will clear the crossmember better.
Depending on which style calipers you have on the truck in question(I think Ford switched to bolt on ones in 95, not 100% sure) and the year of the axle you end up with, you may end up needing to change your brake calipers, but, in my case, with a 93 axle in my 86, it was just a matter of sliding them in place in the brackets on the 93 axle and driving the retainer pins in.
Also, last, but most definitley not least, make sure you grab the lower spring plate on the drivers side that sits under the pumpkin for the u-bolts to go through.
While that seems like a laundry list of parts, if you get to take the axle out of a donor truck yourself, they are all very easy to get, if you buy just a bare axle, you may be in for fun.
Once you have the parts, the swap is very straightforward, and goes very quickly. I used all new hardware, u-bolts etc when I did the swap, and, we pulled out the TTB and had the D60 bolted in under the truck in about 4 hours.





