Replace my 1.2Ml 19 Cascadia's DD15 Engine or Go for a New Truck?

Your truck as it sits now is basically worth nothing. With a brand new engine you might be able to sell it for the cost of dropping in a new engine.

My 2 cents is that unless you buy brand new again, you're buying someone else's headache. At least you're aware of what you're working with right now. Only you know if the truck is worth putting a $35,000 engine and $10,000+ emission system in it.

What exactly failed on the engine?

 

Do you have an APU? I'm impressed that your emissions system is still original. I've always heard the 1 BOX lasts about 700K and then needs to be replaced. You have given me some real hope here.

 

Agreed. Right now you have nothing that anyone wants to buy. I'd invest in the engine and either try to sell it after that, or run it for a couple more years.
But as of right now, you have nothing.

 

I'm not extremely knowledgeable, but is the actual engine shot, would it be worth doing an out of frame rebuild instead? It'll be like brand new, yes?

 

What actually failed?

 

Buy the same thing and use old truck as a parts warehouse…(if you have a spot to let it set)….for future cannibalism