ExxWhy wrote:
This is way out of my knowledge base. You are telling me that larger medium duty class trucks (4500/5500/6500) have stricter emission standards than consumer grade (2500/3500) pickup trucks? Makes no sense to me, but if that is what comes from the government it wouldn't shock me. Can you enlighten us on that?
I completely disagree with the last sentence. More capable does not equate to less reliable, just the opposite IMO.
Yes, medium duty class 4500/5500/6500 and cab & chassis 3500's have different emissions certifications than a complete pick up truck. Complete pickups go through a chassis dyno certification and incomplete vehicles go through a engine dyno certification for emissions that also differ based on the GVWR of the truck. They are de-rated based on the on the limit of each GVWR and/or purposely derated by the manufacturer to sell a higher power package.
That is the reason why a Ram 3500 CTD pickup has a max of 385/950, but the 3500 cab & chassis max's out at 325/750. Both have different emissions certifications dictating their power levels.
