Originally Posted by 4100 Fire Truck
I'll never forget what I heard was the difference between GMC, and Chevy from when I was a little kid. A GMC was just a Chevy with lock washers!
I did notice star lock washers on the inner fender-to-fender bolts on a pristine GMC 3600. Chevrolet's don't have them.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission