GM created the model PD-4102 by restyling its 41-passenger bus in 1950 using a distinctive new front end with the destination sign below the windshield but retaining the rear end of the PDA-4101. Only 116 were built.
In 1951 GM finished the restyling by updating the rear end and changing the model number to PD-4103. Production of this bus totaled 1,501 with Greyhound buying a substantial quantity. Many also operated for Trailways and other operators.
Information from the Bus World Encyclopedia of Buses – 1988