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Don't know about the earlier Ford 7.3L.
http://www.dieselpowermag.com/tech/ford/0703dp_international_diesel_engine/
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Don't know about the earlier Ford 7.3L.
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The Cummins 5.9L seems to be offered in some class 8 vehicles up to a bit over 60k lbs, but I've seen comments from people who've driven different configurations say that they're better suited for vehicles at 30k lbs or less. The Ford 6.0L seems to also be offered in some class 8 vehicles, (the Cummins 5.9L is offered in some medium duty Fords), but it has had well known teething problems. GM seems to offer the Isuzu engine in the pickups up to class 5 and then switches to an 8L engine. Don't know about the earlier Ford 7.3L.