OK. If it's a 7.3 ZF then it's the model S6-650. Destroked makes the adapter plate to fit that transmission to a B series Cummins. Price for that part is $795. Requires a Ford 6.0 diesel starter which they sell for $199. Adapter plate includes the bolts to mount the transmission and starter. Use your original Cummins bolts to mount the adapter plate. These adapter plates require a slight relief on the engine block skirt. It in no way weakens the block. Just some extra metal left over from the casting that interferes with the starter mounting. Full instructions are provided for this. You will also need a flywheel spacer which they sell for $110. So a little over $1100 to adapt the transmission to the engine block. If you go this route be sure and contact them and specify the regular B engine. The common rail engines use a different adapter plate. Same cost, but different. Now for the clutch and flywheel. The flywheel used with these plates is the one that came with either the NV4500 or NV5600 Dodge Cummins. The pilot bearing will need to be replaced with one for the Ford transmission. The clutch assembly will be a Ford style made to match this. Several companies offer the flywheel/clutch set. South Bend Clutch is one company and ValAir Inc. is another. The South Bend kit retails for $862.50 which will handle 800 lb ft of torque. They have stronger ones if needed. ValAir prices might be a bit cheaper. You would need to contact them and specify the transmission and engine combo. So, you're looking at roughly $2000 to mate a diesel ZF to the Cummins. One of the reasons most try to use a Dodge transmission. There may be other companies with the adapter plates but they are all about the same cost. Destroked hasn't changed their prices in over 10 years. Few companies can say that.