The F-250’s had reverse cut Dana 44’s up until 1987 with the Dana 50 optional. Most F-250 SuperCabs came with the D50 due to the added weight. The D50 became standard in 1987.
The dana 44 ttb HD was still standard in a f250HD and a single cab, my 1989 f250 HD has one. Don't know if they ever changed that till the super duties came out, but I know that was still the formula in 1989, dana 44 TTB hd standard with a regular cab, dana 50 ttb optional order, all f250 super cabs had the dana 50 ttb.
I never thought about it till you mentioned it in your second post, but anyone on this board should have a stock diesel truck, and they were all f250hd so they all would have the full float axle. So anyone on this board should be looking for a full floating axle if they want to keep their truck original.