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There are several tools available for calculating these angles, including angle finders, protractors, and various specialized instruments. We scored this handy pinion-angle gauge from Powerhouse Tools. Equipped with a magnet to secure it to an endcap of the U-joint, the simple gauge features a level that allows you to measure where the pinion sits in relation to the driveshaft. Make sure the U-joint cap youre measuring from sits parallel to the ground.