GMC 1982 Light Duty Truck Service Manual page 412

4 A -1 0 PROPELLER SHAFT
Fig. 4A-20--Bearing Cap Removal Sequence
apply a small amount (approximately 18 grams) of
grease inside the slip yoke before installing propshaft.
O n v e h i c l e s w i t h t w o
p r o p s h a f t y o k e m u s t
t r a n s m i s s i o n f u l l y f o r w a r d
h a n g e r .
2. For C-P and most G models with two-piece propeller
shafts, proper phasing is accomplished with the
alignment key, shown in figure 4 A - 18.
3. For G-K models with two piece shafts, install front half
into transmission and bolt support to crossmember.
a. Slide grease cap and gasket onto rear splines.
b. Rotate shaft so front U-joint trunnion is in correct
position. See figure 4 A - 19.
c. Take rear propeller shaft and before installing, align
U-joint trunnions as shown in figure 4A-19. Attach
rear U-joint to axle. Tighten grease cap.
d. Torque bearing support to crossmember and U-joint
to axle attachments.
FL A N G E Y O K E
C O U P L IN G Y O K E
A L IG N M E N T P U N C H MARKS
Fig. 4A-21-R eassem bling C oupling Yoke
p i e c e p r o p s h a f t s , t h e f r o n t
b e b o t t o m e d o u t i n t h e
b e f o r e i n s t a l l a t i o n t o t h e
BALL SU PPO RT
TU B E Y O K E
W ASHER
SEAL
TUBE
BALL STUD
C O U P L IN G YO KE
YO KE
Fig. 4A-22--Cross Sectional View of CV Joint
CONSTANT VELO CITY UNIVERSAL JOINT
Inspection
An inspection kit including two bearing caps and two
snap rings is available to allow the removal o f the two
trunnion caps shown at location 1, in figure 4A-20. Mark the
flange yoke and coupling yoke for reassembly in the same
position, as shown in figure 4A-21.
To service the trunnion caps, use the app ro priate
procedures given in the beginning of this Section.
When both bearing cups are free, disengage the flange
yoke and trunnion from the centering ball. N ote that the
ball socket is part of the flange yoke assembly, while the
centering ball is pressed onto a stud and is part of the ball
stud yoke. See figure 4A-22. Pry the seal from the ball
socket and remove washers, spring and the three ball seats
as illustrated in figure 4A-23.
1. Clean and inspect ball seat insert bushing for wear. If
bushing is worn, replace flange yoke and cross
assembly.
Fig. 4A -23--Exploded View o f Centering Ball Mechanism
BALL
BALL SEAT
FLA N G E YO KE