Kamal, I don't necessarily disagree. Not that it makes a ton of difference but I should've clarified that the driveshaft was not fully custom. I started with a used Ford driveshaft. Cut the weld off the cap toward the rear end, pulled the cap, cut the tube to length and rewelded the cap back on. Scribed a line before everything was pulled apart, lined everything back up, double checked the caps were square to a true surface and put back together. The front factory cap was never touched, so I always had that as a good baseline. If these driveshafts were of typical passenger vehicle length then I wouldn't hesitate to balance it.