I am thinking about puting my 01 d max engine in a 6.0 2500hd or 8.1 truck. has any one done this and how big of a pain is i?. aslo if i have a 01 engine what year trucks i can i do the swap on?
You can check out Ed's truck. This truck was orignally a 6.0 truck. Maybe he will chime in with some more answers.
http://www.duramaxdiesels.com/forum/showthread.php?t=5231
Here is a write up on a guy who put a dmax in a 2500hd Sub....It should answer most of your questions