Stans T-Rex uses 2 1/2 ton Rockwells, I have plenty of those but the ratio is no good for what I want to do with them. USA 6x6 has a neat little gearbox for a 14 bolt but it's not what I'm after and I have experienced USA 6x6 and refuse to deal with them again. I'd like to see something in the 2 1/2 ton range but I really need the ratio in the 4.10 range, my F-450 has a 5.9 Cummins and Alison AT545 auto with no overdrive. The other option would be a divorced transfer case with dual outputs, the rest I can take care of from there, I haven't researched that yet.
Thanks,
Mark