Replaced the OEM 2-piece driveshaft with the Shaftmaster 3.5" aluminum one with adapter plate. Followed TacoBills directions, and it was a piece of cake. Have since run it up to 90mph with no vibration,no noise, no clearance issues.My pinion gear angle is at 1 degree up, the shaft is at 3 degrees up, and the trans is at 2 degrees up. This complies with the Ford maintenance manual which says the front and rear net angles should be within 1 degree of each other and no more than 3 degrees total.

Not so lucky with my new upper control arm. See subsequent post.