5. Press the caps fully into position by placing a
small socket on one bearing cap. Tighten the
vise until the cap is pushed in far enough to
install the snap ring. With one snap ring in place,
use the socket to force the other cap into
position. Install its snap ring.
6. Repeat this procedure on the other universal
joint, if needed.
After assembly, check the action of the U-joint.
Swing it back and forth into various positions. The
joint should move freely, without binding. Double-
check that all snap rings have been installed properly.
Once the U-joint has be checked and is working
properly, reinstall the drive shaft back into the vehicle
1. Wipe off the outside slip yoke and place a small
amount of grease on the internal splines. Align
the marks and slide the yoke into the rear of the
2. Push the slip yoke all the way into the extension
housing and position the rear U-joint at the
3 . Pull back on the drive shaft and center the rear
universal properly. Check your rear alignment
4. Install the U-bolts, bearing caps, or yoke bolts to
secure the rear universal joint.
5. With the rear universal joint secured, lower the
vehicle to the ground.
6. Test-drive the vehicle for proper operation.
Check for unusual noises, vibration, and other
Constant Velocity Joint Service
Constant velocity joint service requires the
disassemble of the joint. Refer to the service manual
for the vehicle when servicing a CV joint. The manual
will give special detailed directions that are required
depending on the type of joint.
Once the CV joint is disassembled, obtain a CV
joint repair kit (usually includes new joint components,
grease, boot, and bootstraps). When the joint is being
assembled, refer back to the service manual for
Always use the recommended type of
grease on a CV joint. The wrong type of grease
will cause boot deterioration and joint failure.
CV joint kits provide the correct type and
amount of grease required.
After reassembling the CV joint, fit the boot over
the joint. Make sure the boot ends fit into their grooves.
Install the bootstraps. Do not overtighten the straps, as
they may cut the boot or break.
Center Support Bearing Service
The center support bearing is normally
prelubricated and sealed at the factory. However, some
support bearings have lubrication fittings and require
lubrication at regular intervals. Even though
lubrication extends the useful life of the bearing, they
eventually wear out. The first indication of support
bearing failure is excessive chassis vibration at low
speed. This is caused by the bearing turning with the
drive shaft in the rubber support.
When a faulty bearing is suspected, it should be
inspected for wear and damage. If the rubber support
shows any evidence ofhardening, cracking, or tearing,
it should be replaced.
Should you encounter a faulty support bearing,
replacement procedures are usually limited to
separating the drive shafts, unbolting the bearing
support from the frame or cross member, and sliding
the bearing and support assembly from the shaft.
If only the bearing is available from the parts room,
disassemble the unit by gently prying the bearing out
of the rubber support. Next, remove the dust shield
from the bearing. All parts that are to be reused should
be cleaned. When the bearing is being replaced, some
manufacturers recommend that waterproof grease be
placed on both sides of the bearing, not for a lubricant
but to exclude water and dust from the bearing. Install
the dust shield and press the new bearing into the
Before securing the bearing support to the frame or
cross member, check the service manual to determine
if shims are required for alignment purposes. When
reassembling support bearings, you should exercise
care to ensure that proper alignment of the drive line is
maintained. This will prevent abnormal wear of the
REVIEW 1 QUESTIONS
What are the four functions of a drive line