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The switch to a GIANT diameter one-piece driveshaft is fairly popular among the DODGE diesel crowd. The two-piece has been replaced in regular production by an OEM one-piece on the latest models. The problems for most had to do with the angle (should be plural) of the DS under different loads.
It's an expensive change. I've seen reports of slightly better performance, but it's a change I would make coincide with R&R of carrier bearing & DS. The one-piece aluminum shaft is lighter in this case over the steel two piece so an FE change is likely . . based on a heckuva lot of miles. Ironically it also may not last as long as the OEM piece (in our case the main DS is over 60").
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