GMC Trim Levels Q?

[special-K]

What's the exact lowdown on how the GMC levels ran through the years from 67-72? I have never been 100% sure so I'll keep my mouth shut and listen to what you all know. The emblems can be misleading. I want to know how which model was labeled as well,such as emblems on the glovebox and fenders,as well as SPID. In '67 the Super Custom was the Chevy CST equivalent. It had it's own badge,but it only said Custom on a unique fender badge. The Custom was equal to the Chevy Custom and had it's own Custom script on the fender. Sierra Grandes came out in '69,before Chevy Cheyennes and Cheyenne Supers. Did Sierras come out in '69? Were base 71/72s called Customs or have no name still? Why do some on;y show V-Six or V-Eight on the fender badge? Some GMCs had a Custom Script on the door. Which ones? Lets get all this straight through the years,including what badge/emblem and where.