I get asked this QUESTION more than ANYTHING else 

Thank you Sir!

The reason I'm asking is cause I want to do a 6.0 4l80 swap in my 2005 V6. So will a 03-05 rwd 2500 be a good candidate for a donner truck?

The 2500 series brackets are different and won't fit 1500 series trucks. You need the v8 brackets for a 2wd 1500 truck. Otherwise the 2wd 2500 is an excellent donor, it will have everything else you need.