Today, average retail is estimated at nearly $27K, and the most recent 1973 GMC Sierra Grande sale recorded by Classic.com went for $31,000. The first GMC square-body truck grilles featured three ...

However, the average sale price of $21.925 keeps them squarely in the practical arena. In the final year of the official square body truck run, we include the 1987 Scottsdale to show that the ...