Mercury F2AZ-4635-C U-Joint Repair Kit

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That is a tube running between the transmission and the rear (or front) axle which transmits power towards wheel. It has universal joints on either end to allow for bending. On some driveshafts, there is a splined lip yoke that attaches it onto the transmission assembly while others have a slip yoke that permits suspension movement. Since the slip yoke at the front is not sealed completely, it uses an oil seal to prevent leaks. A driveshaft calls for infrequent attention such as lubricated universal joints and replacement in case of breakdowns. Hence, it should remain clean from dirt and debris or checked for possible wearing out of balancing weights. This will be indicated through noise or vibration when driving possibly diagnosed by road testing or checking for worn universal joint caps.

Single-cardan U-joints on some 1970 through 1988 models and all 1989 and later models can be replaced by following these steps. First, remove the driveshaft and snap-rings from the spider. Place the driveshaft on a workbench equipped with a vise and use a pipe or large socket to press out the bearing caps. Transfer the sockets to the other side and press out the opposite bearing cap. Pack the new universal joint bearings with grease and position the spider in the yoke. Install the bearing caps and snap-rings, then fill the joint with grease. Finally, reinstall the driveshaft. For double-cardan U-joints, remove the snap-rings and mark the relationship of the components. Press out the bearing caps and remove the centering ball and dust cover. Install new components and press in the bearing caps. Install new snap-rings and reassemble the front U-joint by removing the centering socket.

A press or large vise will be required for this procedure. It may be advisable to take the driveshaft to a local dealer service department, service station or machine shop where the universal joints can be replaced for you, normally at a reasonable charge. Remove the driveshaft as outlined previously. Using a small pair of pliers, remove the snap-rings from the spider. A pair of needle-nose pliers can be used to remove the universal joint snap-rings. Supporting the driveshaft, place it in position on a workbench equipped with a vise. Place a piece of pipe or a large socket with the same inside diameter over one of the bearing caps. Position a socket which is of slightly smaller diameter than the cap on the opposite bearing cap. To press the universal joint out of the driveshaft yoke, set it up in a vise with the small socket pushing the joint and bearing cap into the large socket. Use the vise or press to force the cap out, stopping just before it comes completely out of the yoke. Use the vise or large pliers to work the cap the rest of the way out. Transfer the sockets to the other side and press the opposite bearing cap out in the same manner. Pack the new universal joint bearings with grease. Specific instructions for lubrication will be included with the universal joint servicing kit and should be followed carefully. Position the spider in the yoke and partially install one bearing cap in the yoke. Start the spider into the bearing cap and then partially install the other cap. Align the spider and press the bearing caps into position, being careful not to damage the dust seals. Install the snap-rings. If difficulty is encountered in seating the snap-rings, strike the driveshaft yoke sharply with a hammer. This will spring the yoke ears slightly and allow the snap-rings to seat in the groove. If the snap-ring will not seat in the groove, strike the yoke with a brass hammer - this will relieve the tension that has set up in the yoke, and slightly spring the yoke ears. This should also be done if the joint feels tight when assembled. Install the grease fitting and fill the joint with grease. Be careful not to overfill the joint, as this could blow out the grease seals. Install the driveshaft, tightening the companion flange bolts to the torque.

The driveshaft sends engine power to the rear axle through the transmission. At either end of a driveshaft universal joints are used. Although many U-joints are single-cardan type, some 4WD models have double-cardan U-joints. A slip yoke is located at the front of a rear driveshaft, and it connects to a differential by means of a flange yoke. Front driveshafts on 4WD have a slip yoke on each end. The only time a driveshaft may need attention is when the universal joints wear out and need replacing as they are serviceable items which require little maintenance otherwise. Additionally, the driveshaft should be inspected for damage during service procedure and cleaned of any debris that might be present in order for it to function properly again as well.

A press or large vise will be required for this procedure. It may be advisable to take the driveshaft to a local dealer service department, service station or machine shop where the universal joints can be replaced for you, normally at a reasonable charge. Remove the driveshaft as outlined previously. Using a small pair of pliers, remove the snap-rings from the spider. A pair of needle-nose pliers can be used to remove the universal joint snap-rings. Supporting the driveshaft, place it in position on a workbench equipped with a vise. Place a piece of pipe or a large socket with the same inside diameter over one of the bearing caps. Position a socket which is of slightly smaller diameter than the cap on the opposite bearing cap. To press the universal joint out of the driveshaft yoke, set it up in a vise with the small socket pushing the joint and bearing cap into the large socket. Use the vise or press to force the cap out, stopping just before it comes completely out of the yoke. Use the vise or large pliers to work the cap the rest of the way out. Transfer the sockets to the other side and press the opposite bearing cap out in the same manner. Pack the new universal joint bearings with grease. Specific instructions for lubrication will be included with the universal joint servicing kit and should be followed carefully. Position the spider in the yoke and partially install one bearing cap in the yoke. Start the spider into the bearing cap and then partially install the other cap. Align the spider and press the bearing caps into position, being careful not to damage the dust seals. Install the snap-rings. If difficulty is encountered in seating the snap-rings, strike the driveshaft yoke sharply with a hammer. This will spring the yoke ears slightly and allow the snap-rings to seat in the groove. If the snap-ring will not seat in the groove, strike the yoke with a brass hammer - this will relieve the tension that has set up in the yoke, and slightly spring the yoke ears. This should also be done if the joint feels tight when assembled. Install the grease fitting and fill the joint with grease. Be careful not to overfill the joint, as this could blow out the grease seals. Install the driveshaft, tightening the companion flange bolts to the torque.

A local dealer service department, service station, or machine shop.

Pack the new universal joint bearings with grease.

Driveshafts have a "slip yoke" at the front end that inserts into the extension housing of the transmission or transfer case. On two-piece rear driveshafts, a center bearing supports the driveline. The rear end of all rear driveshafts connects to the rear axle's differential pinion flange using a flange yoke with four bolts. Front driveshafts on 4WD models may have a slip yoke at either the front or rear end, depending on the vehicle type.

Remove the snap-rings retaining the bearing caps, marking their positions beforehand. Start by removing the bearing caps in the center yoke and then the driveshaft yoke, ensuring proper alignment. Replace the centering ball and dust cover on the companion flange. Disassemble the center yoke and driveshaft yoke, installing a new spider bearing in the driveshaft yoke. Insert new caps and seals, ensuring the grease fitting faces away from the center yoke. Press the caps into place, align the marks, and secure with sockets. Assemble the centering stud, center seal, and centering spring, connecting the companion flange to the center yoke with a new spider. Press in the caps and install new snap-rings as needed.

Remove the snap-rings retaining the bearing caps, marking their positions beforehand. Start by removing the bearing caps in the center yoke and then the driveshaft yoke, ensuring proper alignment. Replace the centering ball and dust cover on the companion flange. Disassemble the center yoke and driveshaft yoke, installing a new spider bearing in the driveshaft yoke. Insert new caps and seals, ensuring the grease fitting faces away from the center yoke. Press the caps into place, align the marks, and secure with sockets. Assemble the centering stud, center seal, and centering spring, connecting the companion flange to the center yoke with a new spider. Press in the caps and install new snap-rings as needed.

It is recommended to consider professional assistance from a driveline repair or machine shop.

Partially install one bearing cap, start the spider into the bearing cap, partially install the other cap, and then press the bearing caps into position.