. . . One person pointed out that GM was not an AD. GM is known as ND (New Design). Is this true? . . .
Almost, but GM means General Motors: GMC means General Motors Company
Advance-Design (A-D) 1947 - 1955 (first series 1955) Chevrolet trucks (a General Motors product)
New Design (ND) 1947-1955 (early 1955 Z series) General Motors Company (GMC) trucks (a General Motors product)
