Was there a time that Ford worked with Cummins?
Or is my memory failing?
Yes... lots of F-650s came with Cummins.
I had a 26' F-650 box truck with an Eaton Fuller 6 speed. She could stay in that Cummins power band RPM like a champion. Never had a better drivetrain in my life... for work.
Thought so.
Are you looking at a used or new tranny?
Might check gearstar. My only knowledge is from roadkill who they sponsor. But it seems they make stuff that might fit your pursuit.
The Excursion was a cool vehicle. As was the Centurion.