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Prior to disassembly, Jim Goodlad, known as "GM Jim" throughout the Internet, is responsible for R&D and new product design. He started by checking out the driveshaft angle with the suspension unloaded, which showed 20 degrees. To check the pinion angle, he then rotated the driveshaft 90 degrees and found it at 16.5 degrees, giving a total of 3.5 degrees working angle. While this isn't necessary, it's a good practice to follow because it provides a baseline to ensure that the new setup will drive smoothly with no vibration.