thanks for the correction jocko! seems like I've seen the 133" WB GMCs referred to as Sierra Grande synonymously.. my bad for repeating it..
besides jocko's info posted around the board, this article is about all I've found on the subject.. and after reviewing it again, doesn't shed much light on the GMC production..
The Chevrolet Longhorn Truck Page
so jocko, what's your perspective on the op's question about production numbers?
mine is a well optioned ochre '71 Chevy C20 I bought for my mom to use on the farm.. running great btw, and getting used
thanks!