8 3/4 identification help

3.91 stamped right on the ring gear.

Bearings are in good shape...Bearing adjusters seemed loose, but Idk what the end play is.
Definitely an open Center. Axles came right out with the 5 bolts on the tubes. Drums and pads honestly look like new. Idk if they need replaced due to age, but they look new. Gear oil looked new...I think someone was in this not too long ago.