Ultimately, it is irrelevant what the pan capacity is. You are going to fill it according to the dipstick, assuming your stick is the correct dimension (38" from the hilt to the tip). Maybe double check it against another car.
Filling to the dipstick full mark, assures that the pickup won't ventilate. It is the dimensional relationship of the stick to the bottom of the pickup that is important, regardless of pan capacity.
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