The taper is the same as the ORD D60 crossover arm I have. I've laid them side by side and they are identical. Even Mudzer saw these arms in person and said they were identical. We had talked about the situation with others experiencing different tapers on different pitman arms and have both agreed that the Superlift arm is the same as the ORD arm.
Not exactly sure how much drop is on it as I've never had a stock arm on hand to lay them side by side. I do know they are the exact same drop as any other aftermarket lift manufacturers arms. If you take a look at most pics of anybody who have the crossover conversion, the arm is the same drop as theirs.
The thing I like about the Superlift arm is that it has more beef, or material, around it. Skyjacker arms seem to be too small. They have a smallish part at the drag link end and the body of the arm "tapers" to a wider part up at the steering box end.
The Superlift arm is all beef. Its thick and "squared" all the way from top to bottom.
I've bought 2 of these Ford pitman arms, separately at different times, from Rocky Mountain Suspension Products. They have them listed in their magazine ads for $50 even.
BTW, most aftermarket lift manufacturers advertise these Ford arms to fit either the 4" or 6" suspension lifts. I've seen these on the 2wd boxes and they give the perfect amount of drop and most importantly, give the necessary clearance for the drag link to clear the bottom of the frame rail.
I'm not real sure if the stock, straight pitman arm will work as good as a drop arm would. With a straight arm, the nut and threads that fasten to the arm will protrude up, and when turning left to right, with a straight, stock arm, the nut and threads can be very, very close to rubbing against the frame rail.