Harvey, is what you're saying that if a '07 truck has had previous emissions problems there may be some damage to the internal parts of the engine and components unrelated to the emissions systems?
Are there really any differences between an early 6. 7 and the later model 6. 7's after all updates have been done?
Ted,
The most important thing anyone should understand from my comments is that I don't truly know. I am only speculating. I am a Dodge-Cummins owner of some experience, an enthusiast, and a reader, but am not a mechanic and don't even play the part of one on television.
I think that trucks that get sooted up from improper duty cycle frequently have had to have turbos cleaned or replaced and egr valves cleaned or even replaced. That leads me to wonder if those trucks were ingesting a lot of soot. If so, some damage in the form of accelerated wear, hopefully minor, could have resulted to cylinder walls, rings, pistons, valve guides and stems, etc.
Again I don't really know but Cummins and Dodge may have made a few minor running changes to turbos and other internal components during the first year of operation. I think I remember one of the TDR member/Dodge mechanics mentioning upgraded components in posts when complaints were showing up and being discussed here.
An '07. 5 truck that never had a problem or one that had all the software upgrades done without a lot of CELs and codes set is probably functionally identical to later models.
If I owned an early ISB6. 7 that never displayed problems I would consider myself a man who understands how a Cummins-powered Dodge Ram should be used and be satisfied and proud of my truck.
I have believed all along and have said so here to the anger and resentment of several that early ISB6. 7 problems were likely to have been caused primarily by the way they were used. They were never intended to be used as grocery getters and short distance commuter cars.