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DRIVE SHAFTS AND UNIVERSAL JOINTS
16 - 17
sured distances are n o t t h e same (or nearly t h e
same), t h e axle i s mis-aligned. A x l e a l i g n m e n t r e -
quires repair or replacement o f t h e s p r i n g a n d t i g h t -
e n i n g t h e U-bolt n u t s w i t h t h e correct torque.
Three causes o f axle horizontal mis-alignment are
possible:
"
• loose or sheared s p r i n g center bolt,
• loose s p r i n g clips, a n d
• loose s p r i n g shackle brackets.
(1) Before inspecting t h e drive p i n i o n gear shaft
(axle) yoke f o r h o r i z o n t a l mis-alignment, measure
t h e rear wheel axle horizontal alignment. A mea-
surement tool can be fabricated f r o m a d r i l l rod.
(2) Fabricate t h e tool from a long piece o f 1/2-inch
(12.7-mm) diameter d r i l l r o d a n d a short piece o f 3/
4-inch (19-mm) diameter r o d w i t h one end ground to
a p o i n t (Fig. 13.)
(3)
D r i l l
a 1/2-inch
(12.7-mm)
diameter
hole
t h r o u g h t h e 3/4 -inch (19-mm) diameter r o d near t h e
end opposite t h e p o i n t t o accommodate t h e 1/2-inch
(12.7-mm) diameter rod. D r i l l a n d t a p w i t h threads
a n intersecting hole a t t h e same end o f the r o d to a l -
low t h e use o f a s m a l l set screw (Fig. 13).
(4) Measure t h e distance " Y " f r o m the straightedge
to t h e center of the r e a r axle tube at each side o f t h e
vehicle w i t h t h e fabricated measuring tool (Fig. 13).
I f t h e distances v a r y more t h a n approximately 1/8 of-
an-inch (3 m m ) , inspect for one or more of the three
possible causes o f axle h o r i z o n t a l mis-alignment.
(5) Clamp t h e short straightedge to t h e drive p i n -
ion gear shaft (or use a r o u n d b a r and a wedge i f the
p i n i o n gear shaft is equipped w i t h a yoke), so t h a t
the straightedge/bar i s p a r a l l e l t o t h e surface ( F i g .
13). Verify t h a t t h e straightedge/bar is level w i t h a
s p i r i t level.
(6) Measure t h e distance " W " between t h e t w o
straightedges (or straightedge a n d bar) a t each e n d
of t h e short straightedge/bar w i t h the tape measure
(Fig. 13). Ensure t h a t t h e tape i s held p a r a l l e l to t h e
frame r a i l .
(7) T h e t w o distances should be w i t h i n 1/16 of-an-
i n c h (1.58 m m ) o f each other. I n t h e event t h a t t h e y
are not, t h e yoke i s mis-aligned and should be re-
placed.
DRIVE SHAFT— REMOVAL/INSTALLATION
ONE-PIECE
REAR DRIVE
SHAFT-REMOVAL
There are t w o types o f one-piece drive shafts:
• outboard slip yoke type—used w i t h Model D-150,
D-250 a n d D-350 vehicles equipped w i t h a t r a n s m i s -
sion extension housing; and
• i n b o a r d slip yoke type—used w i t h Model W-150,
W-250 a n d W-350 vehicles (i.e., vehicles
equipped
w i t h a transfer case).
(1) Raise a n d support t h e vehicle.
(2) M a r k t h e drive shaft a n d t h e rear axle drive
p i n i o n gear shaft yoke (Fig. 14) for i n s t a l l a t i o n a l i g n -
m e n t reference.
CAUTION: Do not allow the drive shaft to drop or
hang from either U-joint during removal. Either at-
tach it to the vehicle underside with wire or other-
wise support the loose end of the drive shaft to
prevent damage to the U-joints.
(3) Remove t h e rear U-joint a t t a c h i n g screws a n d
both strap clamps f r o m t h e rear axle d r i v e p i n i o n
gear shaft yoke (Fig. 14).
(4) Before r e m o v i n g the drive shaft slip yoke
from
t h e transmission/transfer case output shaft ( F i g . 14),
t h e vehicle front end should be lowered s l i g h t l y t o
prevent loss o f transmission/transfer case f l u i d .
(5) Remove t h e drive shaft slip yoke f r o m t h e
transmission/transfer case output shaft yoke ( F i g . 14)
and remove t h e drive shaft from t h e vehicle. U s e
care to prevent damage to the protective boot
( a n d t h e d r i v e s h a f t a n d s l i p y o k e s p l i n e s ) .
(6) Examine t h e protective boot for evidence o f
damage. I f no damage is apparent, do n o t d i s t u r b t h e
boot.
CAUTION: It is very important to protect the ma-
chined, external boot contact sealing surface on the
slip yoke and the drive shaft (Fig. 14)) from damage
after the drive shaft has been removed from the ve-
hicle. Otherwise the boot possibly will not seal
properly on a rough, scored/scratched surface.
ONE-PIECE
REAR
DRIVE
SHAFT-INSTALLATION
(1) Raise and support the vehicle.
CAUTION: Do not allow the drive shaft to drop or
hang from either U-joint during installation. Either
attach it to the vehicle underside with wire or oth-
erwise support the loose end of the drive shaft to
prevent damage to the U-joints.
(2) V i s u a l l y a l i g n t h e drive shaft and d r i v e p i n i o n
gear shaft (axle) yoke i n s t a l l a t i o n reference m a r k s
and connect t h e drive shaft slip yoke to t h e t r a n s m i s -
sion/transfer .case output shaft yoke (Fig. 14).
(3) Position t h e drive shaft rear U-joint spider a n d
bearing caps i n t h e rear axle drive p i n i o n gear shaft
yoke "saddles" (Fig. 14). I n s t a l l t h e strap clamps a n d
screws. T i g h t e n t h e clamp screws w i t h 19 N*m (14 f t -
lbs/170 in-lbs) torque.
(4) Remove t h e supports and lower the vehicle.
TWO-PIECE
REAR DRIVE
SHAFT-REMOVAL
(1) Raise and support the vehicle.
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