A518 46RH rebuild
Here is the 727 trans mount setup from my 89 Ramcharger. There is a u-shaped bracket bolted to the trans. There is a large shaped adapter bracket on the bottom that matches the crossmember. And sandwiched in between is the actual rear trans mount with rubber insulator.
Now here is the actual 46RH setup that came from the 92 D250. There is a shaped bracket on the bottom of the trans. Notice there is no bottom adapter. On this one, the trans mount with rubber insulator mounts right onto the crossmember.