No, the Powerstroke is made by International. Ford has had trouble with International, and I understand they were looking at producing their own Ford diesel engine.

The Sterling Bullet is an awesome truck, but they're basically the same as the Ram 4500 and 5500 cab and chassis models. They utilize the same 6.7L Cummins, either the G56 6-speed manual or the Aisin 6-speed auto, and the gross weight is 16,500/19,500 lbs. There have been some discussions about Sterling trucks on the diesel forum.