See Figure 1
The driveshaft is the means by which the power from the engine and transmission is transferred to the differential and rear axles, and finally to the rear wheels. It incorporates two universal joints, one at each end, and a slip yoke at the front end of the assembly, which fits into the back of the transmission.REMOVAL
- Matchmark the relationship of the rear driveshaft yoke and the drive pinion flange of the axle. If the original yellow alignment marks are visible, there is no need for new marks. The purpose of this marking is to facilitate installation of the assembly in its exact original position, thereby maintaining proper driveshaft balance.
- Remove the four bolts or U-clamps which hold the rear universal joint to the pinion flange. Wrap tape around the loose bearing caps in order to prevent them from falling off the spider.
- Pull the driveshaft toward the rear of the vehicle until the slip yoke clears the transmission housing and the seal. Plug the hole at the rear of the transmission housing or place a container under the opening to catch any fluid which might leak.
UNIVERSAL JOINT OVERHAUL
See Figures 2, 3 and 4
- Position the driveshaft assembly in a sturdy vise.
- Remove the snaprings which retain the bearings in the slip yoke (front only) and in the driveshaft (front and rear).
- Using a large vise or an arbor press and a socket smaller than the bearing cap on one side and a socket larger than the bearing cap on the other side, drive one of the bearings in toward the center of the universal joint, which will force the opposite bearing out.
- As each bearing is forced far enough out of the universal joint assembly, grip it with a pair of pliers, and pull it from the driveshaft yoke. Drive the spider in the opposite direction in order to make the opposite bearing accessible, and pull it free with a pair of pliers. Use this procedure to remove all the bearings from both universal joints.
- After removing the bearings, lift the spider from the yoke.
- Thoroughly clean all dirt and foreign matter from the yokes on both ends of the driveshaft.
When installing new bearings in the yokes, it is advisable to use an arbor press. However, if this tool is not available, the bearings should be driven into position with extreme care, as a heavy jolt on the needle bearings can easily damage or mis-align the bearing.To assemble:
- Start a new bearing into the yoke at the rear of the driveshaft.
- Position a new spider in the rear yoke and press the new bearing 1 / 4 in. (6mm) below the outer surface of the yoke.
- With the bearing in position, install a new snapring.
- Start a new bearing into the opposite side of the yoke.
- Press the bearing until the opposite bearing, which you have just installed, contacts the inner surface of the snapring.
- Install a new snapring on the second bearing. It may be necessary to grind the surface of this second snapring.
- Reposition the driveshaft in the vise, so that the front universal joint is accessible.
- Install the new bearings, new spider, and new snaprings in the same manner as you did for the rear universal joint.
- Position the slip yoke on the spider. Install new bearings, nylon thrust bearings, and snaprings.
- Check both reassembled joints for freedom of movement. If misalignment of any part is causing a bind, a sharp rap on the side of the yoke with a brass hammer should seat the bearing needle and provide the desired freedom of movement. Care should be exercised to firmly support the shaft end during this operation, as well as to prevent blows to the bearings themselves. Under no circumstances should the driveshaft be installed in a car if there is any binding in the universal joints.
- Carefully inspect the rubber seal on the output shaft and the seal in end of the transmission extension housing. Replace them if they are damaged.
- Examine the lugs on the axle pinion flange and replace the flange if the lugs are shaved or distorted.
- Coat the yoke spline with special purpose lubricant. The Ford part number for this lubricant is B8A-1589-A.
- Remove the plug from the rear of the transmission housing.
- Insert the yoke into the transmission housing and onto the transmission output shaft. Make sure that the yoke assembly does not bottom on the output shaft with excessive force.
- Locate the marks which you made on the rear driveshaft yoke and the pinion flange prior to removal of the driveshaft assembly. Install the driveshaft assembly with the marks properly aligned.
- Install the U-bolts and nuts or bolts which attach the universal joint to the pinion flange finger-tight.
- Tighten the U-bolts nuts evenly in steps to 8-15 ft. lbs. (10-19 Nm). Flange bolts are tightened to 70-95 ft. lbs. (91-123 Nm).