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Universal Joints - Finding the Right Size
Determining What Size Universal Joint (U-Joint) You Need is Simple
Start by Determining the Spline Size
To determine the spline size of a component (rack and pinion, steering column and steering box), measure the outside diameter and count the number of splines. If there is a flat spot on the shaft and some of the splines are missing, count halfway around where there are splines and double that number. We need to know how many teeth are in a theoretical full circle.
