The GM PD-4103 is a model of coach built by GMC, in the United States, in 1951 and 1952. It was a 37- or 41-passenger Parlor-series coach and was an improved version of the earlier PD-4102 "transition" model. A total of 1501 were built, 900 in 1951 and 600 in 1952, plus one that was converted by GMC from a PD-4102. In early 1953, this model was replaced by the groundbreaking PD-4104 "Highway Traveler".