I don't know what you are talking about, the new 6.7L is a sweet engine. 7.3 was good and then IH decided to screw up so Ford built there own diesel without having to take the bailout.
You're kidding......right?
So far the new 6.7 is having Piston Meltdown problems that are throwing Rods through the blocks. They've been good motors for going to go get groceries in.....but when one puts any type of torgue to them to get a "Load" going down the road (The HotShot Guys pulling 15K - 20K lbs), their engines are melting like throwing butter on a hot skillet.
Yes.....the 7.3 was a GREAT motor....but don't blame either Ford or Navistar for the demise of that thing. Blame the Government........
As far as 6.0 and 6.4 Diesels that were built jointly between Ford and International/Navistar, the Problems were ALL on Ford. Navistar provided a Block that could handle 260-280HP Max, and Ford was throwing on their own Fuel Injection system that was pushing the HP up to 300-350HP, thus causing all the problems between the 2. There are thousands and thousands of International Wrecker Units / Box Trucks / Ambulances / Etc built from 2003 to 2010 that have the EXACT same block in them with Navistar Fuel Injection Systems on the road today that have thousands and thousands of Miles on them that have had NOWHERE near the Problems Ford had with their 6.0 & 6.4 PowerJokes.
In the Lawsuit Realm/Battles that has taken place in the courts between Ford & Navistar over the years concerning the fight over these problems......It's like Navistar 150 Wins VS Fords 150 Loses.
Wanna discuss Cummins - Duramax - PowerJoke issues and concerns......I'm Ready.