Question on model designations..

[jocko]

For me personally, in order of importance:
For maintenance and repairs:
1. Chassis Service Manual
2. Chassis Overhaul Manual
3. Factory Assembly Manual

For understanding what was available on which trucks and what the RPOs mean, etc:
GM VIKs as mentioned above are indispensable.

And don't overlook the little glovebox owner's manual. It's kinda funny - I have two 2001 trucks - one I bought new, and one I bought a month ago. I read the owner's manual just for grins to refresh and was amazed how much I'd either forgotten or just plain never knew in the first place over the last 18 years on my 1st one.

For decoding model #'s and VINs, just use the front few pages of the LMC Truck catalog. There are also threads on here devoted to that info also, but very similar to LMC's.