Auto Repair

DIY: Replacing Universal Joints

by Vincent Ciulla

for About.com

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If old parts are to be reassembled, pack bearing cups with Universal Joint grease. Do not fill cups completely or use excessive amounts as over-lubrication may damage seals during reassembly. Use new seals.
If new parts are being installed, check new bearings for adequate grease before assembling.
With the pusher (smaller) socket, press one bearing part way into drive shaft. Position spider into the partially installed bearing. Place second bearing into drive shaft. Fasten drive shaft in vise so that bearings are in contact with faces of vise jaws, Figure 5. Some spiders are provided with locating lugs that must face toward drive shaft when installed.
Press bearings all the way into position and install snap rings or retainer plates.
Install bearings in yoke in the same manner. When installation is completed, check U-joint for binding or roughness. If free movement is impeded, correct the condition before installation in vehicle. If there is a little binding, try striking the yoke with a brass or plastic hammer. It will be somewhat stiff, but that's okay.