Maybe I can leech just a bit more knowledge from some folks that are smarter than I.

As most of you know, my CC was traded to the insurance company for me by an old guy driving a blazer. Ignore stop sign + 55mph + hitting Crewcab = forced trade in. I've been driving my wife's '98 Honda accord since then - until last week when my mom was driving it and hit a deer. Insurance totaled it. My father-in-law was nice enough to give me his 2001 Silverado 2500HD. It's a bit beat up, single cab, long wheel base, and only one speaker works, but I'm ecstatic to have a truck again, especially one that runs well and has a 6 liter V-8 under the hood.
I don't plan on doing anything to the exterior, but I will finally be reinstalling what's left of my audio system from my CC, which I might take pics of and post here if I have time.
Now on to my question: I still have my old HPP3 that I bought for my '01 CC. The little info I've seen on the internet suggests that I should be able to use it with this '01 Silverado. Can anyone confirm this for me? I don't have the unit or the box within reach at the moment--it's been in storage for a while, but I'd love to be able to use it again.
Thanks in advance for the input. And, sorry for my long windedness.

Peace.