Convert 2500HD to 4wd?

[GIZZ]

I searched it, next to no info on the topic.

I have my on and off daily driver 2004 2500hd RCLB, I also have a 2003 GMC 2500HD extra cab long box parts truck, has manual floor shift transfer case.

If it was an easy job I'd like to convert it to 4wd, while I'm at it also would like to add the dual zone climate control and add air conditioning.

Anybody familiar with this conversion? I know I'll need a driveshaft, what else do I need other than time? Or should I do what might be the right thing and just buy another 4wd truck with AC. At the end of the day the truck wont have traction control or staibilitrac that my suburban 2500 has. That stuff works great in bad conditions.