Can you guys give me the LOW DOWN between the GM/Chevy PU & Dodge

Yes, I do agree with that though, you do want to avoid downshifting while towing up the grade. Shock doesn’t help the drivelines, and the harmonics that diesels carry to the driveline is also another factor. When the operational rpm and the harmonics are at the same frequency, bad things start to happen, usually in the rear axle. It’s a common topic over in the diesel threads.