Engine switch please help
 

Are they both 5.7s? If so, should be a direct swap.

Yes, they are both 5.7 V8 hemis, i was just confused about the 1500 and 2500 wasn’t sure if they would match

Yep, same motor, maybe slightly different programming. You should be able to drop it in, hook it up, and be ready to roll.

The 2500s don't have MDS, so you will have to pull the plugs and put in the selenoids.

Did they even have MDS in 05? Thought that was and advent of the 09 redesign? Or wast that the VVT thing?

Actually aren't the MDS selenoids located under the intake manifold?

I think they are relatively easy to get to, but, in an application that DOESN'T use MDS, there won't be connectors for them in any event. It is my understanding that the pcm energizes the solenoids to disable those cylinders, so, simply not having them hooked up *should* work just fine.

Now, if the truck the engine is going into actually HAS MDS, and expects things to change when it tries to engage it, (it will still cut fuel to those cylinders) THAT will be a problem. The engine block should be the same though, but, I think cam, and lifters are different as well, so, it isn't just a matter of adding the solenoids. Easier approach might be to disable MDS in the programming.