There's only a few requirements that have to be met with my search. It has to be adaptable to a Chevy bellhousing, and it HAS to be a diesel. I would prefer something light and powerful. I'm almost deciding against the 6.2L because of it's size and weight. Anything with comparable power, or even more for that matter, that's smaller than the 6.2L would be great. I was thinking of a Cummins engine. I know there's a 6bt that comes in the 3500's and all that great stuff, but I also thought that there was a smaller version. Whatever it is, it needs to be able to pull 40" tires down the highway with the 465 tranny and all of that great 1 ton axle stuff. It's also going in a Toyota, so keep that in mind. Thanks for any help you can give me.