The 1999-2003 Ford 7.3 Diesel 6-speed works well behind a Cummins engine. Ford started using this transmission in 1999. If your truck did not have one of these transmissions originally you may want to consider swapping one in, especially if you are planning to use your truck for heavy trailer pulling. They are rated for 520 ft/lbs of torque.
The adapter plate for this transmission uses a 2003 - 2007 Ford 6.0L diesel starter, depending on the adapter plate you order. Grinding the bell housing starter pocket is required to give necessary starter to transmission clearance.
The Adapter Plate Kit includes everything you need except a Dodge Cummins 6 speed flywheel, and clutch. While you're at it buy a South Bend Clutch Kit from us and then you'll have everything!