[Tinner12002]

On a later model Ram dually with the 6.7 the towing difference between 3.73s and 4.10s without the Aisin and HO motor is about 3000lbs, with the Aisin and HO motor there is a 6000lb difference so there is obviously more than just gear ratio involved. I had to look at the dually as those ratios aren't available on the SRW. The OP has an older 5.9 so I'm guessing the difference would be a lot less. Plus the auto trans in those models is a weak link also. Personally, I'd maybe look for a later model Ram with the bigger motor though I realize that may not be an option.