FYI, My 04.5 Dodge Dually with a 5.9 diesel has an upgraded transmission. The input shaft is billet and heat treated along with several other upgrades. Someone may be able to do the same to our trannies but what will break next and at what power level will be the big question. The only way we are going to know is if someone foots the bill to figure it out. We may just be at the design limit of the tranny. I know the diesel guys with NV5600 or G56's gave up. They just changed out to an automatic since the R&D was already massive for the 48re/47re auto trannies.
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