Dana axle identification 60?61? 70 or 80

OK did a little more digging. The Dana-80 was used through the 2000 model year (when they downsized to the Dana "78"). You have an 11.25" ring gear, which is larger than the newer E450's, and 35-spline axle shafts which is easier to source limited slip or lockers for. Beyond that, there are still a lot of small parts which very from axle-to-axle. Is the axle tag still attache to the diff cover? It's like a metal strip between two of the bolts, usually vertical on the driver's side. This will have the BOM number which can be referenced to find the exact parts your axle came with (of course, things could have been changed if you are not the original owner).