The most common reason Slip Stubs wear out is inadequate or contaminated lubricant. Late production slip stub splines were coated with Glidecote plastic coating to extend spline life, but any slip joint that has been run dry will quickly wear and lead to vibration and/or clunks. Replacing splined Slip Stubs is best done by a qualified driveline shop that can balance the finished assembly, however any competent machinist with a long bed lathe can successfully replace a splined stub. Ford used several diameters of driveshaft tubing for 1959-1979 rear driveshafts depending upon the year, engine, transmission, and wheelbase. Verify your tube inside and outside diameter, plus the spline count/diameter/length before ordering! See TM3000 Driveshaft Manual or TSB3510 manuals for driveshaft assembly runout specifications.
Slip Yoke spline wear and damaged yoke ears are the two usual reason to replace your slip yoke. The yoke ears can get wrecked when a worn u-joint lets go under load or from getting tweaked using excessive force when replacing universal joints. Spline wear is usually caused by inadequate or contaminated lubricant. All the Slip Yokes we offer for 1966-1979 Ford 4x4 rear driveshafts are made to fit 1-3/8" x 16 spline slip stubs.
To order a replacement Slip Yoke Determine the u-joint series and measure the distance from the center of the u-joint hole to the end of the yoke splines. Also verify the spline outside diameter, number of splines, and spline length on the matching Slip Stub (most will be 1-3/8"-16 spline with 2-1/4" spline length). Replacement Slip Stubs are also available, but in addition to the the spline outside diameter, number of splines, and spline length, you need to know the driveshaft tube diameter and wall thickness.
