[DadsHemi]

That would be correct, get the 3500 SRW with the HO. Just as an example my 18 is 385/930 tq. With my tow tune I run 425/1360 at the flywheel, to the ground using the standard 18% loss through the drive train 348/1116. Take in that these numbers are at 65% engine load in 6th gear pulling. At 70% engine load Aisin will shift to 5th gear keeping you right at 1780 rpm with 4:10 gears. 18% loss is a standard but I’ve experienced more of a 16% loss to be true. I said all this to say just as an example emission intact tune does wonders and my Aisin works flawlessly.