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— DRIVE SHAFTS AND UNIVERSAL JOINTS
16 - 3
CONSTANT
VELOCITY (CV)
SPLINED SLIP YOKE
J9016-19
Fig. 2 Front Drive Shaft (4WD)
BEARING
BEARING
CAP
J8916-1
Fig. 3 Single Cardan U-Joint
• eight sets o f spider needle bearings,
• sixteen bearing seals,
• eight b e a r i n g caps and r e t a i n i n g clips, a n d
• one d r i v e shaft yoke.
Capscrews are used to a t t a c h the socket yoke t o the
transfer case output shaft
flange.
VEHICLE CONFIGURATION
The rear drive shaft (Fig. 1) is connected t o b o t h
t h e drive p i n i o n gear shaft (axle) yoke and t h e t r a n s -
mission (or t h e transfer case) o u t p u t shaft v i a a sin-
gle cardan U-joint coupler ( F i g . 3). A n i n t e r n a l l y -
splined, slip-yoke type U-joint coupler is also located
at the transmission (or the transfer case) end o f t h e
shaft.
WASHER (LARGE OD)
3-BALL SEATS
Fig. 4 Double Cardan (CV) Joint
I f equipped for 4 W D operation, t h e front drive
shaft (Figs. 1 and 2) is connected t o t h e f r o n t axle
drive p i n i o n gear shaft yoke v i a a n i n t e r n a l l y - s p l i n e d
slip yoke and a single cardan U-joint coupler (Fig. 3),
and to t h e transfer case o u t p u t shaft yoke w i t h a
double cardan (CV) j o i n t coupler (Fig. 4 ) .
VIBRATION
VIBRA TION
SOURCES
Objectional v i b r a t i o n , w h i l e t r a v e l i n g o n roads/
streets w i t h a "good" surface, can o r i g i n a t e a t the fol-
l o w i n g locations:
• wheels/tires/brake drums;
• engine/mounts/engine accessories;
• clutch/torque converter/transmission; a n d
• drive shaft/U-joints/axle yoke.
Tires t h a t are "out-of-round" (i.e., r a d i a l " r u n o u t " )
or wheels/tires t h a t are excessively unbalanced w i l l
cause a l o w frequency v i b r a t i o n t h a t w i l l induce
p r o m i n e n t m i r r o r a n d door "shake". T i r e
and/or
wheel faults m u s t be corrected before
proceeding
w i t h t h e diagnosis. I f necessary,
refer
to Group
22—Tires A n d Wheels for service i n f o r m a t i o n .
B r a k e drums t h a t are excessively unbalanced w i l l
a cause harsh, low frequency v i b r a t i o n . Refer to
Group 5—brakes for service i n f o r m a t i o n .
Engine v i b r a t i o n faults can be located b y accelerat-
i n g
t h e engine
(transmission
i n
" N E U T R A L " )
t h r o u g h the speed range a n d n o t i n g t h e speed w h e n
(if) the v i b r a t i o n occurs.
Refer t o Group 21—Transmissions f o r service infor-
m a t i o n i n v o l v i n g transmissions and transfer cases.
D r i v e shaft/U-joint (driveline) v i b r a t i o n w i l l i n -
crease i n i n t e n s i t y as the vehicle speed is increased
and i t is not sensitive to engine torque. A v i b r a t i o n
t h a t occurs w i t h i n a specific speed range ((e.g., 55 to
65 m p h or 88 to 105 km/h) and does not occur above
t h a t speed range is n o t caused by d r i v e shaft unbal-
ance. Defective U-joints or a n incorrect drive shaft
angle are usually the cause of v i b r a t i o n t h a t occurs
w i t h i n a specific speed range.
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