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It's time to measure for a new driveshaft, or in many cases, get it shortened. An easy way to do this is to seat the yoke all the way into the tranny and measure from center to center of where the U-joint cups would be and subtract 5/8 inch. That will leave just enough travel in the driveshaft and minimal yoke sticking out of the tranny. Eliminating extra travel ensures more spline overlap and makes for more driveline stability.