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Factoring in the length of the trans slip-yoke, the prior measurements help determine the correct center-to-center distance between the driveshaft's U-joints, which in our case happened to be 47 1/8 inches. Since Fox Mustangs aren't blessed with particularly commodious trans tunnels, Strange set us up with one of its 4130 chrome-moly 3-inch driveshafts, which is still plenty strong for our application. The tubing has a wall thickness of 0.083 inch, and Strange limits runout to 0.008 inch to ensure concentricity throughout the length of the shaft. At 22 pounds, it isn't exactly light, but we felt the bulletproof ruggedness of a chrome-moly shaft was worth the weight penalty.