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5 is the overdrive gear. In all cars this is the weakest gear. Not a real problem in normal operation. It is one reason O/D in not used when towing anything, though not likely in your 'Bird. O/D typically comes in around 40-45mph. You might use '4' when you find yourself driving near those speeds for an interval and feel the tranny often hunting between gears.
'66 Convertible, 428, in progress