I know some people are curious to know what the difference between a 1500HD and a 2500 is, so i did some research and this is what i could come up with: 1. The 2500 has one more leaf than the 1500HD 2. It sets higher (because of the leaf) 3. The 2500 is available with the 6.0L AS WELL as the 8.1, and the 6.6 deisel 4. The 2500HD has a different frame and different differential than the 1500HD Other than that, I read something about the back seat in the crew cabs, but i couldn't figure it out. It was something like a cover? I hope this helps anyone curious. I'm sure i've left something else out, but this is all i could find.