The Stovebolt Site Forums The Shop Area General Truck Talk ok, what does AD mean? I searched the archive, and no luck

It has been noted in the past that the 37 to 40 Chevrolet trucks were call the "Diamond Series" of Chevrolet trucks. This was the series of trucks that gave us a new overhead valve engine in the 216.5 ci engine, the basis of which was in production with some improvements along the way, until 1962, solidified us into the era of hydraulic brakes, a total redesign of the cab with attention to more driving comfort and a "new design" of rounder fenders and sleeker lines - the beginning of the fat fender look, if you will.

Joe