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Walkthrough of one of my daily welding adventures. Constant velocity drive shaft slip joint for a Sparks Motors SMCO6X6. These incredible trucks take 3 custom built drive shafts to simultaneously power both rear axles, which ‘in turn’ 😏 need to have incredibly straight shafts to keep balance in the drivetrain. Tigging these shafts on a positioner makes for a deep penetrating weld and extremely even heat distortion.