Dodge ram truck 3500 1996 Service Manual page 68

3 - 2 DIFFERENTIAL AND DRIVELINE B R
G E N E R A L I N F O R M A T I O N (Continued)
CENTER BEARING
The two-piece propeller shaft uses a center bearing
to support the shafts. Two types of center bearings
are used. Type 1 is used with the 9 1/4 axle. Type 2
is used with the Dana axles (Fig. 1). Both types are
mounted in the same location.
TYPE 2 TYPE 1
— J9416-2
Fig. 1 Center Bearing
UNIVERSAL JOINTS
The front prop shaft uses a 7290 series universal
joints. The rear prop shaft uses a 7290 series univer­
sal joint with a 9 1/4 axle. A 1410 series universal
joint is used with the Dana 60, 70 and 80 rear axles.
Shaft with 7290 series universal joints use external
snap rings. Shafts with 1410 series universal joints
use internal snap rings.
Two different types of universal joints systems are
used:
® Single cardan universal joint (Fig. 2)
• Double cardan universal joint (Fig. 3)
L U l i i C A T l O N
The slip yoke on the Type 1 front shaft is equipped
with a lubrication fitting. Use a multi-purpose NLGI
Grade 2 EP lubricant.The factory installed U-joints
are lubricated for the life of the vehicle and do not
need lubrication. All U-joints should be inspected for
leakage and damage each time the vehicle is ser­
viced. I f seal leakage or damage exists, the U-joint
should be replaced.
PRECAUTIONS
Use exact replacement hardware for attaching the
propeller shafts. Exact replacement will ensure safe
operation. The specified torque must always be
applied when tightening the fasteners.
Put reference marks on the propshaft yoke and
axle or transmission yoke before service (Fig. 4). This
will assure correct phasing and eliminate possible
vibration.
RETAINER J9416-11
Fig. 2 Single Cardan Universal Joint—Typical
S LINK YOKE
J9316-2
Fig. 4 Reference Marks on Yokes