Re: 7.3 to Allison adapter plate
These adapter plates are pretty easy to make.
Modern laser/plasma cutters are incredibly accurate, to the point where they now need to know the precision you want on bolt holes to make them fit.
I've got a CAD file for the bolt and pin holes for the 7.3 bolt pattern and a 3rd gen Cummins bolt pattern. It wouldn't take much to get the bolt pattern CAD'd for the Allison and then just get a laser cutter to crank out adapter plates for people who want to do conversions.
I might want to do an Allison swap. If someone CAD's the bolt pattern on an Allison and shares it, I'll share my CAD file for a 3rd Gen Cummins bolt pattern.
Aside: In case it wasn't clear, I built the adapter plate for my conversion. I've got over 50,000 trouble free miles on it.
08 F350 King Ranch
Long box CC 4x4
Soon to get a Cummins 6.7 transplant.
Red '99 2WD F250 CC SWB
3rd gen 325/610 Cummins, ZF6
Custom air ride suspension