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If you want even more confusion, there were actually two models in 1955. The 1955 First Series, which looked like the 1954, and was the last of the Advanced Design series trucks (they ran from 1947 to 1955). Mid-year they switched to the 1955 Second Series, and it was the first of the new Task Force series, which ran from mid-year 1955 to 1959.

For the 1955 First Series, the only external difference that I know from the 1954 was in the trim on the sides of the hood. Mechanically, the 1955 First Series had an open drive-shaft between the transmission and rear-end (basically what we're used to seeing on rear-wheel-drive cars). The 1954 had a torque tube, which was a solid tube that connected the transmission and rear-end, and the drive-shaft was contained within the torque tube.