Kevin
I guess that is a very interesting truck you have got, althoe not a CMP as you say..
I recomend you have a look at the GMC site, there you will get plenty of information and hint and tips on GMC's in general
Have a look at
http://www.cckw.org/phpbb2/index.php
if you do not know the forum alredy.
Chers from sunny Norway
Rolf