It's a shame this rumor is just that. To me Dodge has really dropped the ball in the transmission department, and I would love to see a Allison automatic transmission bolted behind the Cummins. People can flap there traps all they want about how made the Allison is, but that is only because they DON'T have one! Any idiot, or sane person need only to look at the difference in the 48RE's(47, and 46 there all the same) wimpy input shaft compared to the monster Allison input shaft to see the huge difference there is between a REAL diesel automatic transmission and a gas automatic transmission. The rest of the trany is just as beefy as the input shaft. Now DTT and ATS have built Alison's that must be pure awesome, I can only wish.
I must say that the Dodge transmission has done remarkably well considering it's long heritage, and all the different vehicles with different power plants it has been bolted into. But, that does not mean it is well suited for the rough life a heavy-duty diesel truck generally See's. Dodge really got their monies worth out of the old 727, now 44 re, 46, 47 and 48 transmissions. We are the only group of diesel truck owners that has to share their automatic transmissions with the smaller mid-size trucks of it's brand. Just seems wrong using the same transmission the 1500 series and Dakota series use, but maybe thats just me???