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I would tend to prefer the 3-bolt design. We never had any trouble with that. Why change a proven and trouble-free design? For the sake of change?
As for issues with the CRD150/151, the customer doesn't care if it's a design or supplier issue. Either way, that's a Volvo internal issue. For the customer, that's immaterial. His truck is down and not generating revenue.
The one bolt design to hold bevel gear onto spur/Helical shaft was introduced with CRD150/151 and is the only carrier series that has that design currently (CRD125/126, CRD202/203 or CRD95/96 have 3-bolt design). The issue you had coming loose is unfortunately not related to the design, it is the suppliers screwing up the heat-treatment and ending up with over-size threads. Bear in mind there are somewhere between 80,000-100,000 trucks in field with this design (Launched in 2009) and if it was a design issue we would have seen huge rash of failures in the field. The one's that have been analyzed show an over-size thread issue. More emphasis is being placed to control the thread size to avoid such issues in the future.
Ok, I'm sure there is a way to send a message direct from person to person so off topic conversation doesn't bog down an ongoing topic, someone gimme a hint as to how, or maybe what to look for to do so
KSB,received my car and driver last week, didn't read the Vw b.s. yet, prefer road tests and nuts and bolts over corporate ethics, but I will read it just to stay informed! My wife's Corolla has the Takata air bags! The rascals sent me a letter warning to not use the r/f seat! They will pay for a rental.car but they are keeping that quiet of course was in one of my automotive publications!