It will be necessary to use a press or large vise for this, but it may be possible to have the driveshaft taken to a repair or machine shop for universal joint replacement at a reasonable cost. Start with the removal of the driveshaft and one should draw the position of the elements and the relation to the driveshaft tube before reassembly. It is now possible to take off the snap-rings from the spider using small pliers and to fix the driveshaft on an arbor press or, in its absence, on the working table provided with a vise. Take one bearing cap and place a pipe or a large socket over it and the other capsule place the slightly small socket over it, now use the vise or press to remove the capsule out and stop it when it gets half way out of the yoke. Screw out the cap all the way and then use the vise or large pliers to take it out completely, do the same to the opposite bearing cap. Replace all reusable components, a new U-joint must not come half and half, old parts must not be used if new ones are added. The new universal joint bearings should be packed with chassis grease in accordance with special instructions if any in this respect. Place the spider in the yoke so it rests on two bearing caps, only one of which should be threaded into place for now, and it's aligned so the output shaft comes out the bottom; make sure any grease fitting is in the right position. Spin the spider onto the bearing cap and orient it into the other partially seated cap then gently seat the bearing caps with interference that does not deform the dust seals. Put in the snap-rings and if so desired, use a brass or plastic hammer to drive them in properly and avoid making contact with the bearings. Screw the grease fitting back and pack the joint to the full with grease but avoid theologizing it. As for the double cardan joint, locate the positions of the spiders and yokes, then take out the snap-rings and treat the driveshaft in a similar manner. As in the removal of the bearing cap, follow the same procedure, clean every part and new U-joint must be replaced as a set. Grease the new bearings, fit the spider, and screw the bearing caps, but while doing so be caution with the dust seals. Insert then the snap-rings and the grease fittings, and fill the joint with standard grease; pack the socket relief and the ball with chassis grease. Put the driveshaft center yoke on the location of the spider ends, then push the bearing and install the snap rings in their respective positions. Last, place and tighten a new seal on the centering ball stud, put the driveshaft centering socket yoke in place and perform the same for the front spider as was done for the rear, turning and tightening all bolts to the required torque.