Is ram 3500 SRW 6.4 hemi enough?

A 400 ft/lb engine at 4k rpm and a 800 ft/lb engine at 2k rpm will be putting equal torque to the rear wheels at the same road speed all else being equal. The 4k rpm engine is only working half as hard letting gear ratios multiply torque to the drive shaft while the 2k rpm engine has to produce 400 ft/lbs of torque more to do the same job. The 4k rpm engine is working twice as fast but only half as hard. But to some, it "sounds" like it screaming or struggling when nothing could be further from the truth. But that's their perception. Why screaming at 2-3k rpm? Why not 1400rpm like a real truck?

Interesting logic. Tell that to Dodge/Ram. A quick walk through the tow ratings provided by them does not support your assertion. The tow ratings are substantially different between the diesel and the gas 6.4 for virtually identical trucks. The 429 foot pounds of the 6.4 can tow with a 4.10 rear end about 16,000 pounds; the Cummins with about 850 foot pounds torque almost twice that at around 30,000 pounds. If the 6.4 at 4000 rpms could do the same work as the Cummins at 2000 rpm I would suspect that would be reflected in tow ratings. Since both have approximately the same horse power, it must be the torque that makes the difference. And that difference is reflected by Dodge/Ram's substantial differences in tow ratings. I have some problems believing that the 6.4 at 4000 rpms is not working as hard as the Cummins at 2000 rpms. Real world seat of the pants stuff just doesn't support that. The Cummins is loafing at 2000 rpms.