I don't think you'll find the driveshaft causing drag.
More then likely I would look at the brakes for drag.
The transmission should have some drag in Drive. The newer O/D transmission have very little drag, unlike the older unoverdriven units, C-4, C-6, FMX.
Put the car in air and try hand spinning the wheels. That will show you where the drag is.
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1968 Cougar
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