The 1968 Plymouth salesman’s car and equipment guide shows that the only manual transmission available with a 383-4 was a 4 speed transmission.
I am pretty sure that this was the same for a 1967 Plymouth Fury.
Keep in mind that in the mid to late 1960s a lot of people were not sold on the reliability of automatic transmissions. In addition, when disc brakes came out in 1966, a lot of car buyers were not sold on disc brakes.
If you were one of those people and lived on a mountain, for example, with steep downhill grades, these people purchased cars with manual transmissions to help slow the car down on a decline to avoid the drum brakes from overheating and not stopping the car. The original owner of the 1967 Fury III that we are talking about may have been someone who lived on a mountain or in an area with many steep hills. Who knows, maybe the original owner of this car transported moonshine.
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