HC,
To be honest, if I would have looked at the picture of your truck first, I probabably could have guessed it (I had a 91 Corvette that color). However, I just scrolled through each year on the Plasti-Kote site for GM colors until I found the GM 3878 number. Maybe not the most efficient way, but it worked. Glad to be able to help. I aquired somewhat of a passion for matching colors when I was a custom painter and frequently had to match colors that no one had documented at all.
Jeff
