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

I have a Ram 3500 Cummins bought new, 220k miles, auto overdrive, but a 4:10 rear, 90% of miles pulling a gooseneck. I always pull in OD because the sucker only runs bout 50 otherwise!!! Never any trans problem, but I agree with RRR, all say do pull in OD!!
Cummins are million mile engines, BUT the injection system can cost $5000 to replace!

For most people a 318 OD 1/2 t is plenty! Me I prefer a 3/4 t. heavier everything without the extra wheels !!