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A few years back Ford sold it's heavy truck line to Sterling, which is subsidiary of Frieghtliner.Frieghtliner was bought by Damiler, which also bought at least a piece, if not all of Detroit Diesel. All this explans why the new Sterling truck we bought at work looks like a Ford, but has a engine in it with both Detroit Diesel and Mercedes Benz markings on it.
Those Sterling trucks, even the 07's and 08's have Ford part numbers on them still.
Allison used to part of DD years ago when it was a subsidaiary of GM. Not sure who ended up with Allison, but I have to assume the evil general still owns part of it.