Speaking of DPFs, I used to work for a company that built fire trucks. We bought engines from engine makers (CAT, Cummins, Detroit), and transmissions and axles and brakes, but we made the frames and cabs and bodies. There was another emissions law change that took effect Jan 2007, requiring DPFs and all that crap. Knowing how much that was going to suck, In 2006 we bought several hundred pre-DPF engines of various HP ratings from all the makers, which buyers could get in their trucks as a special order. We were still installing the last few in the trucks in early 2009. And it was legal.
I can't explain the difference. Maybe even in Dodge's case, as it was in ours, it's not actually the truck that can't be built, it's the engine. But several hundred 5.9 12v would last Dodge a couple of days, and stockpiling several thousand didn't make a ton of sense. It'd last a few months maybe. So they just changed over. And as mentioned, many pickup truck buyers in 1998 were not concerned about the end of the 12v. I know I thought a 24v was twice as awesome as a 12v!
Whereas most fire truck buyers (and all fire truck makers) were seriously unhappy about DPFs.
So there I am, muddying the waters a little further.
I can't explain the difference. Maybe even in Dodge's case, as it was in ours, it's not actually the truck that can't be built, it's the engine. But several hundred 5.9 12v would last Dodge a couple of days, and stockpiling several thousand didn't make a ton of sense. It'd last a few months maybe. So they just changed over. And as mentioned, many pickup truck buyers in 1998 were not concerned about the end of the 12v. I know I thought a 24v was twice as awesome as a 12v!

So there I am, muddying the waters a little further.