Comes down to rust and the condition of the engine and trans.
7.5 diff is a $50-75 item, same with a Dana 28.
Last parts truck I bought was a 2001 4.0 sohc with explorer limited rims. Paid $100.
And it had a cracked head.
Around here you can't give away a 7.5" axle unless they want it for a load of scrap. Same with the Dana 28.

